welcome to the forum
"shouldn't interfere" is a really bad base for bugsmashing in Enderal, or Skyrim in general

deactivate all of them, then check again.
(even if it seems pointless to you, we need to rule out the possibility)
if the problem persists, upload a savegame (
...\Documents\My Games\Skyrim\Saves),
we'll need the skse and the ess of a manual (no quick- or auto-) save,
pack them to a rar or zip archive and attach them to a post here
