Inaccurate cutttings

Hello Guru’s, I am in the process of cutting some ovals. The issue I have is that the cut starts what appears to be normal but on the second pass it cuts into the oval on one side and ruins the piece. I have the material (pvc) screwed down into the wasteboard so its not moving. I also tried cutting a different silhouette and it did the same thing.??? any ideas? I tightened down all eccentric jogged the machine through all it’s motions. It’s an XL. Thanks, Joser

This is likely a mechanical problem:

It may be a matter of toolpaths and feeds and speeds — slotting is hard, see:

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