might be… one more “oddity” I just found: when you add to your library an album from Qobuz (eg, in my case, the Hi-Res version of a CD quality album I already physically have in my library)… it also gets added to your Qobuz Favourites 
“Probably” it’s, once more, just me but… can’t get why and it doesn’t make any sense to me 
(but you can, then, remove it from your Qobuz favourites and it will stay nonetheless in your library)
btw… only way I have found so far to remove albums from Qobuz Favourites is… on Qobuz website or using Qobuz app