Site schedule automagically changes back to older schedule

[OldEmployee]

Every week, I change the schedule as per our requirement, but it keeps changing back to the older schedule.

This also happens with the storage expiry schedule.

I have no idea why the schedule changes back to older value or how I can find out what is causing this.

Could someone please help me understand what might be causing this?

[GertjanA]

Which version is this?

I vaguely recall having had something similar way in the past.. I'll check notes to see if I can find it.

[OldEmployee]

Version 11.0.1 CH5.

I have tried restarting services on the server to see if that somehow resets it, but that was not the case.