This may be caused by one of two issues.
- Issue 1: Arch-Glacor is attempting to use the same animation back-to-back (e.g. right-hand ranged)
- I've implemented a fix and it's now with QA
- Issue 2: Desync issues (as seen with telegraphing in the 'Sanctum of Rebirth')
- It is known and being investigated by our engine/client team.