In the Multidomain list, do a sort on CK (Key) you will probably find that you will have duplicates.
I would not bother to much about it at the moment, it's a mess and you might think you want it cleaned, soon I will be migrating our R80.10 MDS to R80.20 and hope that there this will resolve.
I have been cleaning the mess a couple of times now and spent a lot of time on it without any real results, as a couple of months later your back at square 1. I have no clue why but licensing on MDS level seems to be very difficult to get it right.
Even attaching a license from repository is a 2 or sometimes 3 step process, first time it will tell you ok, but it does not show, second time you add the same license it tells you it's already attached, but still you don't see it, do a get licenses from the CMA and all the sudden ah yeah I have a license.
Regards, Maarten