Hi @lemonaise
Thanks for the bug report.
It seems that because the $_POST['acf_nonce']
is set when saving the post and inserting the user, ACF is saving the data for both of them.
I will add this to the to-do and have it fixed soon.
For now, I would play around with unsetting the $_POST['acf_nonce']
varaible BEFORE you insert the user.
Hope that works for you.
Thanks
E