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Everything appears to join up correctly in what you’ve drawn with the machine, so it’s not skipping steps. I’ll assume all the stepper motors are the same and working also, since if one of the 4 is off/different/bad it will not give you 90 degree corners in the drawing.
That leaves the belts as the next thing to check, since they are what’s meant to give the machine precision in the X/Y drive mechanism.
Sorry, I can’t help anymore than that. If they are all equal length for the teeth counted, there’s some bad magic going on in your machine!