Previously downloaded songs unavailable now on Spotify?

I was on Spotify (I'm always logged in) and I specifically wanted to listen to "Boyz With Fun" by BTS. I have a premium account and I rarely ever have any issues with Spotify.

-When you have saved at least one song by a specific artist, the song pops up underneath the artist's name when you click on it, right?-

So I had saved every song from all of BTS' albums (no singles) and downloaded them on my iPhone, so I could listen to them when offline in public.

Just a few hours ago listening to all of their songs was really easy, but now that I'm home a few of them were greyed out.
Just a few songs from every album was unavailable, then I deleted and reinstalled the Spotify app and now only two of their albums are available for me (You Never Walk Alone and Wings) even though I have saved the other albums as well.

I don't know what to do and it's made me sad because I've gotten really into BTS lately.

It knows that you downloaded them so it will not show it again… I'm in Romania… Spotify doesn't exist here