Windows 10 x64
As seen in the gif below that's how it looks now...
I had it working yesterday, I had like 4 cards. But I had the app opened for a long time without using it, I think I even suspended the PC and used it the next day with the app still in the background. When I tried to move one of the cards to another section it freaked out, and started duplicating it and overwriting the other cards.
I suspect it has to do with the amount of time opened while not being used, or the fact that started to misbehave as soon as I used it again and then probably corrupted the database.