Notifications are not working

Hello,

I have followed the instructions on here

https://helpserver.devolutions.net/index.html?configure_scheduler.htm

and here

https://helpserver.devolutions.net/index.html?configure_notifications.htm

to setup the notifications however, the RDM is not saving the setting for the events. for example, I enable the "Roles" event for "add", "edit" and "delete" (image 01). As soon as I hit the save, the check marks will disappear and entry will be added instead (image 02).

the email and scheduler settings exists and tested the under the sever settings. The user is admin.