Can't do anything after success calibration

hi there
after 2 successful calibration, release tension, remove to make it enter all the belt, then extend all to reput the maslow on board, take slack, all seems good, try to start a dry run, z axis move then they always tell me that im 15 mm off, so the machine stop then even if i try to recalibrate, i got this error to start the work

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If you can paste the contents of the serial messages area (copy/paste) after doing this we may be able to see whats going on…