Root motion stops trigger working

Hi, I have purchased a 3d animated character and a 3d asset pack which contains a door that slides open when triggered.

If root motion is left unticked the scene is really jerky. When the character approaches the door they set off the trigger and the door slides open, as is supposed to happen.

As soon as I tick the apply root motion box (no other changes are made) the trigger to the door no longer works.

If anyone has seen anything like this before can they let me know what I should be looking for to fix this please? Since the code for the character isn't mine I don't think I can just post it so I am posting on the off chance that someone has seen something similar and can tell me what to look for.

Many thanks, J