I think I already know the answer to this but maybe just for clarification.
What is the justification behind using an over/under hand grip when doing a deadlift?
Like I said I think I can see a reason (working different arm muscles) but on the other hand I can also see that grip destabilizing the weight and causing the bar to rotate/twist as you come up and putting strain in the wrong place (like your back or SI joint).
I'll assume that you're supposed to switch the over/under grip to an under/over grip to even things out.
Thread: Deadlift under/over grip