Cutting on an arc

arylic cut
This is a side view of a piece of acrylic from which I tried to cutting a sqaure.
Can anyone tell me why and help fix why my laser is cutting on an arc? I’m sure it’s a setting I have to adjust I just don’t know what that could be. It will not go all the way through to cut the box out no matter how many times I set to pass over it.

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