Groups on doors aren't saving

Hello, there! I’m currently having a problem with my DarkRP server where the doors that I set to specific groups (cops and mayor, gun dealer, etc.) using the F2 menu aren’t saving. After I disconnect from the server, the doors become unowned. I was wondering if anyone else has had this problem before, or if someone knows how to fix this.

Are you using DarkRPModification addon for DarkRP 2.5.1?