“Shake it Off” has been getting worse and worse for dungeons. In AC P1, the gravelings before the final boss (Howler) are able to bounce you around through it. Rampage is iffy as well. Works a little over half the time.
Just now, before the patch, myself and 2 guildies were running HotW P1 and were constantly getting pulled, bounced around and knocked back in the tunnel just before the end boss. (Butcher) It specifically says under Rampage that you cannot be pulled yet it happens either by the Svanir Ballista’s or the Icebrood Elementals.
One way or another, Rampage and Shake it off aren’t workin properly 100% of the time now with the changes to stability. Even with multiple stacks of it on you.