Multiplayer Vaal Temple Progress Bug

Hello,

Whenever my friend and I play coop together, they don't always get their vaal ruins temple progress. I will be at 1/6 crystals and they will be too, except after doing 5 vaal ruins in maps, I am 6/6 and they will be at 2/6 or 3/6. Their progress seems very inconsistent. When we were doing campaign, it was very consistent about us getting vaal temple ruins progress.

Thanks.