@russian-dima If you’re kind enough, only one more clue:
These are all my DB’s fields. With red you have all fields that are NOT working, but strangely, all these fields are completed, no blanks.
With green, there are the 4 fields that are working properly. I can add/delete values and the change is shown. Can you think something about it? The problematic fields all have in common the fact that they all have values in all rows…