[Android oneplus6t] Artists and albums won't show up in my library

[Piccolit]

Plan

Premium for family

Country

Italy

Device

(Oneplus 6t)

Operating System

(android9)

My Question or Issue

I have an issue with my spotify app. If I search the library from my mobile, quite a few artists and albums are missing. Moreover, they are not sorted alphabetically.
I have checked on the desktop app on my PC and all looks like it should with artists, albums and all the rest where they should be.
I tried reinstalling the app on my mobile but no luck.
Anyone have any clue on how to solve this?
Thanks

[Piccolit]

Update: I updated the desktop app and it did the same, removed lots of stuff from my library.
Not bad for 15€ a month!

[Piccolit]

Roughly 80 artists I was following, removed from my library! 
Can anybody help?
Thanks a lot in advance..