Fill and Line setting not lining up

I have my rotary setup and runs fine if only using fill setting. However if i change to fill and line or just line and the rotors has to go back and forth while marking the line seem to shift off in the X and Y axis direction about .1 inch. I have slowed down the acc and max speed. I have also calibrated the rotary and read through the LB setting for the rotary but can seem to find the smoking gun.

Can you clarify? Is it shifting along X or shifting along Y? One axis drives the rotary while the other is moving the laser head.

It’s mostly along the y axis or in this case the rotary

Not sure if you can see attachment but if you look at the centers you can see they don’t line up. This seems to happen when rotary goes back and forth. Almost like it has lost motion but everything seems right.