I have seen weird similar behaviour like this when using the Attribute manager. We took the Teamshare back to being a Solo file purged all the crud and re-shared it.
I haven't seen this behaviour in while now I think it was a couple of updates back when this happend. Are you on latest version of AC12?
AC versions 3.41 to 25 (UKI Full 5005).
Using AC25 5005 UKI FULL
Mac OSX 10.15.7 (19G2021) Mac Pro-2013 32gbRam AMD FirePro D500 3072 MB graphics