Boss raind xp

Did you try to do a boss raid and use res pots?

I just notice that when you use the res pots the xp is really low, in comparison when you don't use them...

Is just me? or is it bugged?

I am about to try my 2nd attempt, I Will check and see if there is a big difference. I didn't have any res potions on my first raid so I had dumbbells equipped still.