Printer printing at 36mm of print bed

What is this going to do and is it something I will have to do every time or just this once?

G28 = Go to home position
G90 = Use absolute positioningG91= Use relative positioning
The difference is the after G91 if for example the last X was 10 and y was 10 and Z was 10 and now I send G1 X10 y20 Z10 it does not move on the X and z axis and only on th y for 10 as 2010 is 10 so it calculates the relative move wheras after a G28 and a G90 it assumes it is at the home position and moves to positon 10,10,10

Thank you so much for the help. I will try it and let you know what the outcome is.

Well I tried that and it did the same thing. Homed the printer, G90, resliced and print. Nothing changed.

Is it at the beginning when you print I assumed you pause for whatever reason to change filament or something. Maybe take the first 50 lines of the Gcode file and post it here. If its at the beginning of every print could be the homing is off. Also where does the printer home ? in the top corner (front or back) or at the bottom somewhere

Also what slicing software do you use ?

I am using the mattercontrol slicer which has been working fine until a month ago or so.
So when I want to print something I create the part, slice it with mattercontrol. Then hit print. It homes the printer (homes to the top) and goes to the hot end warm up position. As soon as it is to temp it goes to the xy position but does not drop the z axis.
I’ll try and post some gcode later.

Also post the homing position for example on my printer its x0,y0 z215. You can also go to the probe offset and type in 30mm and see if it prings it down to about 6 At some point during an upgrade when MC "lost" the paper thickness and Z offset my printer was off by 15 I exported the printer and then read to the file (forgot what its called but it was either paper thickness or Z something that was set to 15 so I set it to 0 and then re  imported the printer. You could also try to create a new printer I had to do that 2x due to something going "Funny" in upgrades So create a new printer and call it "myprinterV2" and see if that helps. Its a pain and its one reason why I slice in SLIC3R and then just run it through MC to apply the bed leveling.

Ok so my homing position is x10,y10,z235. Homing to max.
Here is the GCode that I exported from the slice....
; Software Leveling Applied
; Generated with MatterSlice 2.19.6
; filamentDiameter = 1.68
; extrusionWidth = 0.4
; firstLayerExtrusionWidth = 0.56
; layerThickness = 0.3
; firstLayerThickness = 0.3
; automatic settings before start_gcode
G21 ; set units to millimeters
M107 ; fan off
M104 T0 S210 ; start heating extruder 1
T0 ; set the active extruder to 0
; settings from start_gcode
G28 ; home all axes
G1 Z27.51 F5000
; automatic settings after start_gcode
M109 T0 S210 ; Finish heating extruder1
T0 ; set the active extruder to 0
G90 ; use absolute coordinates
G92 E0 ; reset the expected extruder position
M82 ; use absolute distance for extrusion
; Layer count: 3
; Layer Change GCode
; LAYER:0
; LAYER_HEIGHT:0.3
; TYPE:FILL
M400
M107
G1 X0 Y0 Z7.81 F5400
G1 X4.05 Y2.08 Z7.79
G1 X8.11 Y4.17 Z7.77
G1 X12.16 Y6.25 Z7.75
G1 X16.21 Y8.34 Z7.74
G1 X20.26 Y10.42 Z7.72
G1 X24.32 Y12.5 Z7.7
G1 X28.37 Y14.59 Z7.68
G1 X32.42 Y16.67 Z7.66
G1 X36.47 Y18.76 Z7.65
G1 X40.53 Y20.84 Z7.63
G1 X44.58 Y22.92 Z7.61
G1 X48.63 Y25.01 Z7.59
G1 X52.69 Y27.09 Z7.58
G1 X56.74 Y29.18 Z7.56
G1 X60.79 Y31.26 Z7.54
G1 X64.84 Y33.34 Z7.52
G1 X68.9 Y35.43 Z7.51
G1 X72.95 Y37.51 Z7.49
G1 X77 Y39.6 Z7.47
G1 X81.05 Y41.68 Z7.45
G1 X85.11 Y43.77 Z7.43
G1 X89.16 Y45.85 Z7.42
G1 X93.21 Y47.93 Z7.4
G1 X97.26 Y50.02 Z7.38
G1 X101.32 Y52.1 Z7.36
G1 X105.37 Y54.19 Z7.35
G1 X109.42 Y56.27 Z7.33
G1 X113.48 Y58.35 Z7.31
G1 X117.53 Y60.44 Z7.29
G1 X121.58 Y62.52 Z7.28
G1 X125.63 Y64.61 Z7.26
G1 X129.69 Y66.69 Z7.24
G1 X133.74 Y68.77 Z7.22
G1 X137.79 Y70.86 Z7.2
G1 X141.84 Y72.94 Z7.19
G1 X145.9 Y75.03 Z7.17
G1 X149.95 Y77.11 Z7.15
G1 X154 Y79.19 Z7.13
G1 X158.06 Y81.28 Z7.12
G1 X162.11 Y83.36 Z7.1
G1 X166.16 Y85.45 Z7.08
G1 X170.21 Y87.53 Z7.06
G1 X174.27 Y89.61 Z7.05
G1 X178.32 Y91.7 Z7.03
G1 X182.37 Y93.78 Z7.01
G1 X186.42 Y95.87 Z6.99
G1 X190.48 Y97.95 Z6.98
G1 X194.53 Y100.03 Z6.96
G1 X198.58 Y102.12 Z6.94
G1 X202.64 Y104.2 Z6.92
G1 X206.69 Y106.29 Z6.9
G1 X210.74 Y108.37 Z6.89
G1 X214.79 Y110.45 Z6.87
G1 X218.85 Y112.54 Z6.85
G1 X222.9 Y114.62 Z6.83
G1 X226.95 Y116.71 Z6.82
G1 X231 Y118.79 Z6.8
G1 X235.06 Y120.88 Z6.78
G1 X239.11 Y122.96 Z6.76
G1 X243.16 Y125.04 Z6.75
G1 X247.21 Y127.13 Z6.73
G1 X251.27 Y129.21 Z6.71
G1 X255.32 Y131.3 Z6.69
G1 X259.37 Y133.38 Z6.67
G1 X263.43 Y135.46 Z6.66
G1 X267.48 Y137.55 Z6.64
G1 X271.53 Y139.63 Z6.62
G1 X275.58 Y141.72 Z6.6
G1 X279.64 Y143.8 Z6.59
G1 X283.69 Y145.88 Z6.57
G1 X287.74 Y147.97 Z6.55
G1 X291.79 Y150.05 Z6.53
G1 X295.85 Y152.14 Z6.52
G1 X299.9 Y154.22 Z6.5
G1 X299.9 Y160.61 Z6.46
G1 X299.9 Y166.99 Z6.42
G1 X297.3 Y166.99 Z6.42
; TYPE:SKIRT
G1 F7200
G1 X297.94 Y165.92 Z6.43 E0.095 F1500
G1 X298.59 Y164.84 Z6.43 E0.189
G1 X299.23 Y163.77 Z6.44 E0.284
G1 X300.35 Y162.27 Z6.45 E0.426
G1 X301.46 Y160.76 Z6.46 E0.568
G1 X302.3 Y159.83 Z6.46 E0.663
G1 X303.14 Y158.91 Z6.46 E0.757
G1 X303.98 Y157.98 Z6.47 E0.852
G1 X304.91 Y157.14 Z6.47 E0.947
G1 X305.83 Y156.3 Z6.48 E1.042
G1 X306.76 Y155.46 Z6.48 E1.137
G1 X308.27 Y154.35 Z6.49 E1.279
G1 X309.77 Y153.23 Z6.49 E1.421
G1 X310.84 Y152.59 Z6.49 E1.516
G1 X311.92 Y151.94 Z6.5 E1.61
G1 X312.99 Y151.3 Z6.5 E1.705
G1 X314.69 Y150.5 Z6.5 E1.847
G1 X316.38 Y149.7 Z6.5 E1.989
G1 X317.56 Y149.28 Z6.51 E2.084
G1 X318.73 Y148.85 Z6.51 E2.179
G1 X319.91 Y148.43 Z6.51 E2.274
G1 X321.73 Y147.98 Z6.51 E2.416
G1 X323.54 Y147.52 Z6.51 E2.558
G1 X324.78 Y147.34 Z6.51 E2.653
G1 X326.01 Y147.15 Z6.51 E2.747
G1 X327.25 Y146.97 Z6.51 E2.842
G1 X328.5 Y146.91 Z6.51 E2.937
G1 X329.75 Y146.85 Z6.51 E3.031
G1 X331 Y146.79 Z6.5 E3.126
G1 X332.25 Y146.85 Z6.5 E3.221Obviously not all of it but I just grabbed what I thought was important.
This is the output from MatterControl as it started to print....'
ok 1
SelectExtruder:0
FlowMultiply:100
M114
ok 1
X:5.00 Y:35.00 Z:27.290 E:0.0000
G90
ok 1
G92 E0
ok 1
M82
ok 1
M400
ok 1
M107
ok 1
G1 X4.38 Y30.63 Z24.85 F5400
ok 1
X:5.00 Y:35.00 Z:27.290 E:0.0000
G1 X3.75 Y26.25 Z22.42
ok 1
G1 X3.13 Y21.88 Z19.98
X:5.00 Y:35.00 Z:27.290 E:0.0000
ok 1
G1 X2.5 Y17.5 Z17.55
X:5.00 Y:35.00 Z:27.290 E:0.0000
ok 1
G1 X1.88 Y13.13 Z15.11
X:5.00 Y:35.00 Z:27.290 E:0.0000
ok 1
G1 X1.25 Y8.75 Z12.68
X:5.00 Y:35.00 Z:27.290 E:0.0000
ok 1
G1 X0.63 Y4.38 Z10.24
X:5.00 Y:35.00 Z:27.290 E:0.0000
ok 1
G1 X0 Y0 Z7.81
X:5.00 Y:35.00 Z:27.290 E:0.0000
ok 1
G1 X9.21 Y36.7 Z27.27
X:5.00 Y:35.00 Z:27.290 E:0.0000
ok 1
G1 X13.43 Y38.41 Z27.26
ok 1
G1 X17.64 Y40.11 Z27.24
ok 1
G1 X21.85 Y41.81 Z27.22
ok 1
G1 X26.06 Y43.52 Z27.21
ok 1
G1 X30.28 Y45.22 Z27.19
ok 1
G1 X34.49 Y46.92 Z27.18
ok 1
G1 X38.7 Y48.63 Z27.16
ok 1
G1 X42.92 Y50.33 Z27.15
ok 1
G1 X47.13 Y52.03 Z27.13
ok 1
G1 X51.34 Y53.73 Z27.12
ok 1
G1 X55.55 Y55.44 Z27.1
ok 1
G1 X59.77 Y57.14 Z27.08
ok 1
G1 X63.98 Y58.84 Z27.07
ok 1
G1 X68.19 Y60.55 Z27.05
ok 1
G1 X72.41 Y62.25 Z27.04
ok 1
G1 X76.62 Y63.95 Z27.02
ok 1
G1 X80.83 Y65.66 Z27.01
ok 1
G1 X85.04 Y67.36 Z26.99
ok 1
G1 X89.26 Y69.06 Z26.98
ok 1
G1 X93.47 Y70.77 Z26.96
ok 1
G1 X97.68 Y72.47 Z26.94
ok 1
G1 X101.9 Y74.17 Z26.93
ok 1
G1 X106.11 Y75.88 Z26.91
ok 1

You seem to have a couple of problems there seems to be some Z offsets stuck someplace Its software . Th Z26 and Z27 should make it print 26 and 27 mm above the plate assuming the plate is 0. If its 36 mm you still got a 10mm problem somewhere
Here is what I would do
Run that gcode
G28 ; home all axesM104 S[temperature]
M190 S[bed_temperature]
M109 S[temperature]
G92 E0
G0 X5 Y5 Z1.2 F1800G1 X230 E50 Z1.2 F900
G92 E0
G28
This should lay down a purge line replace the [temperature] and [bed_temperature] with the apropriate temps or ommit those lines if you set and reached the temp already  we dont want to have a cold extrusion this should dump a line 1.2 mm above the bed if you want on the last 2 lines you can change the Z1.2 to whatever. Make sure you enter those lines in the terminal of MC so it does not add the bed leveling or Z offset. It sheould echo back Ok ....
If that works I would create a new printer and see if that helps or call MH tech support and ask how you can remove an old "stuck" Z value. The bed leveling feature of MC is nice to have otherwise I'd say try SLIC3R or cura and set up a custom profile thereHTH Martin