Issue with machine cutting through border

We are having issues with our machine not cutting accordingly . It seems that the issues are happening on the left side . Below are some pictures of what we wanted to create ( cross with borders ) and what actually got cut . We do not know what we are doing wrong please help !

I would check the coupling between the X motor and X lead screw. It might be slipping there. Also check that the delrin anti-backlash block/nut is not too tight.

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