The center of my galvo isn't really centered in the y axis. How to fix this?

I set up LB to be used with my fiberlaser and I just got started actually making stuff. I went to clean a 50mm x 50mm area on a sheet of aluminum and noticed the one side in the y axis wasn’t burning correctly.

The square i’m using is centered in LB and I have my working space setup to match my lens. I created a cor file using EZCAD and have all that setup correctly. I just dont understand why my center isn’t really center. Is there some kind of offset setting Im missing here?

Edit: It might be center. I sprayed on some paint and it removed all the paint evenly. It’s just that this is not the first time I have seen it do this. Maybe its just used error?

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