Sisters in Spire of Deshar do not gave 10+ lightning resistance

So I have been playing Coop with a friend and clicked the sisters in spires of deshar. Killed everything like normal but then realised we did not get the +10% on lightning resistance. We looked on the map and its checked off on the map.

When I reached the Sisters with my solo character I got the +10%.

I might miss something but the lightning resistance I have only comes from my Gear and there are no +10%.



TLDR: Sisters in Spire of Deshar +10% light.-res. might be bugged for COOP