@typhlosion Do they do that in a mirror? It looks to me like one eye is open more than the other.
I think when we make deliberate facial expressions, we don't always use the muscles on both sides equally. Like we're trying to pull on both symmetrically, but maybe sometimes one is stronger than the other (like it usually is with any muscle), so we pull unevenly on muscles we can't see to even out?
I have a weird habit that when I try to smile for the camera, I raise just one of my eyebrows, or at least differently from the other?... I guess I must've been paying conscious attention to trying to smile with my eyes or something, and whatever I was doing made my eyebrow raise as well, but only on one side. It's really hard *not* to do it.
So, given that one eyelid is tucked up under your brow and the other isn't, maybe you open one eye wider than the other habitually?