Module permissions being lost

I recently migrated about a dozen domains from one Virtualmin server to another. That process went well and everything is working fine except the users for the two domains that have Mailman enabled no longer have access to the module.

I checked the virtual servers themselves and “Mailman mailing lists” is enabled, but when I check the Webmin users they do not have “Virtualmin Mailman Mailing Lists” selected. When I edit the users and turn it on everything works fine for awhile but, as the warning says, eventually the user gets overwritten and the user loses access again.

Anyone have any idea where I can start troubleshooting this?