Hello here. I am trying to make a dobbelt sided pcb. But when i flip the board the other layer is misplaced. Attachments IMAG4040 and IAMG4014

Its look fine in Coppercam. see Attachment pic1

I tried to measure how much offset, compared to the bottom layer and top layer. and set the an offset i coppercam. see Attachment pic2
But in mach3 the offset is lossed so I think I need to do something in Mach3.

Have someone an idea what is wrong here?

Best Regards
Mads