This is an odd thing I've noticed with Burn and Electrocute now; sometimes I'll get a solid hit on an enemy causing a Damage Over Time effect...but it does just 1 damage per "tick", causing a fountain of 1s, instead of 2000-4000 per, which my effects normally do at level 50.
It's not because the target resists it; I've seen it happen to Flesh enemies hit with Shock and Burn damage. And sometimes a target will take multiple normal DOT stacks and one or two "1 damage" stacks. So an enemy won't always be taking 1 damage per stack, one enemy that takes a 1 damage stack will suddenly take full damage the next stack, so it's not because of resistance, immunity or adaptive shields.
I've even noticed these 1 DPS effects on myself now, and not while using an immunity or adaptive shield. It was Fire so it should have done normal damage. Also, oddly enough, I've noticed 2 damage per "tick" DOT damage from my mechro on both Fire and Shock; I think that might be because her Shock DOT is boosted 75%, and her Fire DOT was caused by a skill which turns Shock DOT into extra Fire DOT. So it would seem the base power of the hit was somehow actually 1, amplified to a beefy 2.
What causes these super low damage DOT effects?