so i know what my problem is.
It looks like acf have a limitation over all subfields.
I did delete one field-group with 16 subfield.
It was responsible for a 4 coluns-Layout in a old template from me.
Now i am able to add ne sub-fields or a new field-group.
My first idea was, to delete 3 subfields.
After i delete it, i could add 3 subfields but not more.
If delete 4 subfield -> i could add 4 new.
And suddenly i did delete one complete field-group, so my problem is fixed.
But why acv have a limitation?
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