I wanted to correct a value from the Aspect Ratio screen. Remove 2.59:1 and add Cinerama (2.59:1).
So I deselect the first and select the second. Then hit Save. Result:
This also happens with the Audio Tracks. So I guess the problem is with all those fields of the same type. What does work:
deselecting all items does work, but if you don’t deselect them all it is not saved properly. Only new entries are added.
We reporting bugs double now?

It’s still on the bug list, sorry about that.
Haha, Already had the feeling I reported it, but could not find the ticket 
Already forgot about the issue as well because I was again surprised. 