Although I double checked I have all of them marked as 2/2 it shows that I am missing cards.

I will add also other points of feedback as well:

-The page numbering is wrong.. it starts from 0 and goes to up to number of pages -1 which is weird.

-Would be nice to get some more statistics in the progress page, how many of each rarity are missing and maybe from each set as well...

-Maybe add some kind of wish list?

Edit: I think those "missing cards" are the hero skins? I remember Arthas publishing Aranna as a basic set card