Glaciate stacks are bugged currently. The stacks only seem to go past 5 when using frozen orb, and sometimes the stacks get stuck at 1.
Last Night we noticed this in raid as well, but instead of getting stuck at one stack I petsonally noticed it was getting stuck at 4 and not refreshing or gaining more. We were running two frost mages in the group, if this matters/helps.
Hopwfully a fix comes soon!
I’ve reproduced both of these issues, and we’ll get them fixed. Thanks! 
Edit: Both issues should be fixed.
nevermind i see its in the new set and was bugged for the old sets.
Awesome in 12 weeks ill be able to get it going since we not getting past the second boss