It’s hard to explain in detail, as it happend while creating and updating many things at the same time.
I thought it would have been a common experience that you have noticed. Thanks for your help.
Do you have a response towards the second question, if the fields that have been removed, if they could be cleaned up in the database?
Because in the post meta i can not find a pattern to easily search for the fields. As i don’t remember the exact field names anymore.
Anyway thx, have a good weekend.