I have a character who was level 53 at the onset of taking on DLC2. I leveled up properly as I went through the DLC, but the individual maps of the DLC remained ‘locked’ at the level my character was when I first entered; enemies, loot, and vending machine items would stay in that 52-54 range. Later maps would be locked in the same way, but at the level my character was when I first entered (55, 56).
So I decided to just reset that character’s missions. And for kicks I decided to play through the whole base game, then DLC1, and then DLC2. Everything in the base game and DLC1 was fine, but when I got to DLC2, its maps were still locked to those lower levels.
I’m submitting a formal bug report on this but I was wondering if anyone else encountered something like this.