MB doesn't really have any control over how external programs interpret our metadata - unless the tags are wrong, in which case it should be fixed in our database.
It's a bit tricky also because I have no idea how Kodi works/ how it displays artists - in my music player it just displays each track + artist credit once no matter what. So it might be a bit better to ask Kodi users for help (and then report back here for others to see!)
It's weird that the example of yours that is displaying twice has less tags than the other one... I would have assumed it's the other way round. But if you've tagged everything with MB Picard, the tags should be the same? So try re-tagging both, and tick the clear existing tags button in Picard so you can make sure you're starting from a fresh slate.
The other possibility is that individual tracks are credited differently on the one release? And that Kodi isn't displaying by 'album artist' but displaying an entry for each different 'track artist' combination it finds. Just a thought