So I have a very complex set of custom fields, but have had no problems with it. Recently I’ve just tried saving them and repeatedly it deletes/changes fields when I save.
Firstly, random empty text fields are being added on the top level.
On the most inner level, the last 8 fields are not adding at all,
and the location rule is setting to default.
Could their be some kind of data limit that is causing this strange behaviour?
I’ve just updated and seeing exactly the same behaviour
php max_input_vars. This php setting will limit the number of fields and you probably need to increase it.