Some time recently, the default "recently added" playlist stopped working properly in "album" display mode. Right now it looks like
this. Note the "Not recent" section at the top (what's that supposed to be? those tracks are recent!), and that it's properly sorted from the bottom now (except for the aforementioned "Not recent" section) like
this.
I know this isn't a tagging issue because when I switch to the "track details" display mode everything is where it should be like
this.
I think that the "Not recent" section contains tracks that are part of albums I already have in my library(not duplicates, just added to my library earlier).