Help needed with precision

I have a problem that the burn is noch accurate some lines move in y direction.

as you can see in the picture. (for example the 4 is too low or the boxes are not aligned)
Material didn’t move, I checked it.
And the model looks okay in lightburn.
Belts are tight as I can check.
Other ideas what could cause this?
Thanks for help.

Problem solved. A loose wheel. On the x Axxis.

Would be good idea to post a screenshot from lightburn.

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