i don't know what mods you installed because you didn't tell us... i just looked at your image and knew it has a mod
the thing with mods is many have background files that include or change something else so a hair mod [being part of the head] may include a head file because thats where the maker took the hair from and it doesn't help that Larian only makes part notes everytime they change things
i would need to play an unmoded game to that scene in order to test if this change is Larian or a 3rd party mode
for what its worth my current [unmodded patch 7] character is a gnome durge and i have noticed some changes between that and my last halforc durge so it looks like different races have minor face animations so it could be just a drow change you see
That's not really how mods work (if it helps back up my claim, I'm a modder and I've worked on both hair and head mods: hairs really don't include head leftovers like you're mentioning, they're completely separate). While expressions can look different on different heads, if it's a vanilla head and you notice a difference then you're either misremembering or Larian did indeed change the expression.
