Been there, done that. I have one type one zone stamp on the drawing. When I change the zone stamp in the zone category, then save, the drawing regenerates and changes the zone stamp on the drawing to the edited zone stamp I just saved in the the zone category.
The problem is that the drawing regenerates to the new zone stamp selected within the zone category WITHOUT THE EDITED CHANGES. (the text size and justification)
When I go back to the zone category, it shows me the new zone stamp, BUT IT HAS THE EDITED CHANGES.
Somehow, AC is not connecting the dots.