Editable PDF unlink new fields Action

This is drivign me mad.

So I have this editable pdf with forms that I need to modify (wasn't created by me originally)

"Field A" has in properties an action that resets "Field B", "Field C", "Field D"

B, C, D does the same for A

So if you can only fill/select one of them, clicking or filling one of them resets the others.

Great.

If I duplicate one of them or, more unexpectedly if I create a BRAND NEW FIELD (e.g. "Filed ALPHA")

in all the above fields (A to D), into their properties/action/trigger/etc I find this new field!

they are somehow connected and I have to manually uncheck this new "Alpha" to avoid being erased when one of the above A to D are selected.

how do I avoid new fields to be nested in the logic adopted for the A, B, C, D fields?

thanks in advance for your help

PS: I use Acrobat in italian so maybe some references (Actions, trigger, etc) may be inaccurate