Bane with costume. Ascended Bane to third level. Costume at second level. When Bane Prime ascended, lost ALL levels and ascension’s for both.
That sounds very strange.
Double check you haven’t got a mystery third Bane… that’s all I can think of as an explanation.
If it’s as you described, you need to submit a support ticket in game.
I had the same thought. The costume needs to be leveled on each hero individually. My guess is you have more than one Banes and the leveled costume is on a different one.
You are all correct. I got too busy and looked at a second unleveled Bane I had and thought it was a bug. Yes, I’m an idiot!