Middle area offset when fill/engraving

look at the picture and what is the problem is?
Ruida-6442
laser :Aeon 50w RF laser tube -6090

and my test files

屏幕快照 2020-06-26 下午12.16.26

Could look like too high X axis speed have you tried to slow down a bit?

hi thank your help…
look i did’t revise the line shift when i use a new belt

so the problem is finished

thank you

quick fix, that’s fine :+1:

Thank you have a nice day