Heroes of the Storm

I have been playing Heroes of the Storm for a while. I started playing with a group again and it seems that my champions that I have most certainly unlocked in the past are no longer in my inventory and I have to re-buy them. I noticed when I could no longer play my lvl 8 Guldan or lvl 7 Arthas. I understand the free to play champs but this was not that. I have most certainly bought champions like stitches/guldan/arthas and more in the past and now I have to rebuy them. I dont understand why this is happening and I would like to have those champs back instead of buying them a second time.

There is a forum dedicated to Heroes…you might check there for help…