Hi, Thank you for your feedback. We have fixed this issue in the next version. There is a workaround: you can update the normal and base head separately first, which will prevent moving backwards. Soya Reallusion
Ok by re-creating a neutral character in CC4 it re-imports correctly.
It's really a re-import bug, as in the first Zbrush file where the chara has been sent, the head is not shifted. It shifts as soon as it's sent back to CC4: