Campaign differences
I noticed on my alt that the levels for campaign mobs are much lower than the ones for campaign mobs on my main.
For example on my main chapter 12 stage 6 the final mobs are 78 across the board, on my alt they are 97. That's almost a 20 level difference. While farming the stage for exp on my main, every now and then I will lose the battle. It's a tad infuriating thinking that that would never happen if the mobs were 78 instead.
I took a screen shot from chapter 8. The first is from my main, the second from the alt. Both on brutal. And the third is from my main on hard. Kind of messed up that my mains hard is almost as tough as the brutal.