X and Y moving simultaneously

Hello everyone, I recently had to rebuild my printer after it suffered a catastrophic failure. Now I have everything working again, however as you can see from this video when moving in x it jumps a little in Y, and vice versa. My belt tension appears to be okay, so I’m a bit stumped .
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Solution:
Problem solved. Screw was lose on the stepper motor pulley
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Solution
E-TF[102] Riker
Problem solved. Screw was lose on the stepper motor pulley