Thank you everyone for your answers:)
I think it is, as Dudie said, that the channel was a fan channel, and then was reloaded as legal. I'm a little bit confused, though, since I was mod at season 2, and that one came directly licensed:) Not only my subtitles disappeared, all the subtitles in Romanian vanished, except for the first episode, which has Romanian subtitles provided by the moderator. That can also mean she started to sub again, on her own, after the re-uploading of the channel.
My question rose up from the fact that I was going through my projects, and I saw the picture of that drama, the word "subtitler" (I was assigned), but the number indicated 0. That's all:)
I'm not bothered (not much, at least:)) that the subtitles are gone, since in the previous version, they were anyway massacred by the mighty moderator. Mine, and the the ones of the rest of the team, as well...
Thanks for enlightening me, and for making me a little more wise^^