Chicken Bomber not killing off all enemies

I played the chicken bomber a few days ago and I had some leapers (look like gophers or whatever like fields of misery) that wouldn’t die after multiple attempts. As stupid as it sounds I had no problems with other trash. Bizarre… I had no problem with other trash mobs and I wasn’t on that high of a level with an okay witch doctor.

It’s not PTR-specific. It’s a long outstanding bug…

I know about ones that don’t erase. That’s common. Mine didn’t die and kept attacking me for damage. I hit them multiple times to no effect. Not because I was weak or on a high level it was more like they weren’t taking any damage at all.