Thank you for the feedback. All great suggestions - for your first issue, I had seen that at one point and only once. I've been trying to recreate it on my dev environment again, but the time I did get that issue I just kept running dungeons with them and it flipped back to normal after a couple runs. Must be like an integer overflow thing that's coming back from the experience curve equation.
Dungeon quality will help with item quality, but it's in later levels. So right now there's 3 tiers of items and you start seeing those items first at level 15 dungeons, and then the highest tier items at level 35. I see what you mean though - there should be more gradual scaling instead of just pure random items.
For the leave dungeon and pathing issues - just updated today and it adds the exit dungeon button and I think I have a good fix for pathing issues. It's a hard thing to test because there's so many game state permutations that could cause pathing issues.