X and Y offset in part edit are cumulative, not absolue.
Exemple:
Step 1: i edit batch selection part and i wrote -0,3mm un X, all edit part have -0,3mm offset in X...
Step 2; i edit batch selection part and i wrote -0,0mm un X, all edit part have -0,3mm offset in X...
Step 3; i edit batch selection part and i wrote -0,1mm un X, all edit part have -0,4mm offset in X...
Step 4; i edit batch selection part and i wrote +0,4mm un X, all edit part have -0,0mm offset in X...

Is not very good because i never see what the cumulative offset i have on part.

I close the software and re-start, offset are there and all part offset indicate 0!

-Z1 and Z2 are swap in speed table.

-When head 1 and 2 are setup to camera align, if head 2 pass first on camera 2, head 1 always pass on camera 2 even if setup of this part is camera 1.

For offset? yes, i save when i quit.
To remove the offset, i delete part and reload pik and place list.