Sure! I've got a video of it (apologies, I sound tired xD;) I think I figured out what was going on and I mention it in the video, but just also have it in text: I have a blink set to the mouth layer so that it can have a different position every now and then. The issue happens when the blink is present, but doesn't when it's not. So I guess if that's the core of the issue, should I go about having that blink animation in a different way?
Testing that out, the issue still persists unfortunately. "blink while talking" has the same results. I put a slightly different sprite in the blink talk and could see it picking that one instead.
So far my best solution for this has been to create a mildly long sprite sheet with variations in it for the idle mouth poses, which is honestly good enough for now. I tried doing states for the idle mouth change, but there's a weird jitter/snapping into place of the two frames as they change, so that didn't pan out.
The talk animation is purely set up under the phenom detection. Having a talk sprite or not doesn't seem to affect the animation of talking or otherwise... If that's what you were referring to?