NPCs twitch for a split second when they come into view

[Hansfranz78]

hello,

i realized a problem that i couldn't fix by uninstalling mods or defaulting ini's.

So i deleted all files, inis, configs and saves, installed a fresh version of vanilla Skyrim from steam and my problem is still there.

When i quickly look at npcs they twitch for a split second, than acting absolutely normal.

Every NPC does it, you can see it while they are running standing, idling. You look at them look away and back very fast and than there's a little twitch.
It happens the moment the NPC enters the field of view.

 

When i quikly look around in a full bar with applauding guests, it looks awful.

 

I tried every screen mode, deactivated g-sync. Tried all the ini options. I even tried different graphic driver version.
It happens on SSE 1.5 and 1.6
The problem is not effected at all.

Is this vanilla behaviour?

I spent 2 days trying to fix this. Im sad. I have a RTX 3080.