I started playing through Thieves Guild and noticed some weird lip sync with Quen. Later I noticed Zeira has a similar issue, but this image summarizes it.
Straight out of Mo- uh, oh wait. Um... Ebonheart, I guess?
PC US
Characters: Nathyrin Othrril - Dunmer Stamina Sorcerer Niveth Othrril - Dunmer Stamina Dragonknight
I've noticed this on PS4, too. Their mouths only move up and down, like puppets. Very annoying, and none of the NPCs in other zones seem to be affected.
PS4 | NA | ENG
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Yeah I've seen this too. Really breaks the immersion and takes you out of the moment. Sadly its been broken for so long i doubt they'll fix it, though i'd love to be proven wrong