BUG : Elementalist Self Rooting in Staff Fire Attunement
On further investigation. It appears to be an issue with Meteor Shower.
If meteor shower is attempted to be cast and immediately you cast another spell, interrupting the meteor shower, it will lock you to your position (which is an expected effect of meteor shower)
However because meteor shower does not execute but the rooting part at the start happens you end up rooted and cast the second spell pressed.
Recasting meteor shower removes the root.
This only occurs very occasionally and not every time. It seems there is a certain period of starting to cast meteor shower that causes this and the system still thinks it is casting meteor shower.