After update to PRO 5.1.9 text and translations (german) in admin is messed up or partly missing e.g. “ced Custom Fields PRO 5.1.9”
try to update to 5.1.9.1 that should fix translation bug.
if fields are gone for edit content, look at top right inside options if checkbox with acf-fieldgroup-name is not ticked (there were you manage what is visible or not)