QP341 Z-Height issue

Can someone please shed some light on a QP picking problem I am having? It seems I am having to add more and more z offsets in the programs and unsure why. I have to go in and add 0.4 mm into the Z pick because the nozzle isn�t coming down enough. What�s the weirdest part it can happen right after someone changes a part within the same run. Any input on this would be much appreciated. Let's see who answers first as I already sent off to Fuji this morning.

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