Help with y axis shifting

I have a k40, with C3D board. I am cutting 2 pieces on top of each other. For a couple of weeks, the two parts do cut on each other shifting about 50%. I have checked gantry square, and tightened all belts. When I print only one part, no mater how big, it s engraving ok. Is there a setting in LB that I don’t know of?
it started to do that a couple of weeks ago. I also reduced drastically the speed in betwens parts

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