Got 3 star from a guaranteed 4 star

Doku

StormTrooper Han unlocked as a 3 star right after the game told me he was a 4 star unlock.

Poerli

StormTrooper han cost 50 Shards so he will be a 3* Hero

Doku

I filled his shard bank to unlock him, and it showed that he unlocked at 4. I was pretty happy about that. Then when I went to upgrade him he was only 3.

Pindasauskanon

Hè unlocks at 3. If you have to save 50 shards to unlock a characters, they have 3 stars. 80 shards is 4 stars

Doku

Thanks, I guess it's just a bug. It showed 1 star, then 2 stars, then 3 stars, then 4 stars upon unlocking. It should have only popped up with 3 stars to begin with.