I'm creating a quick scene with a lot of dialog. I have a.WAV audio script for my voice clip, and I'm doing head, face, and body motion manually.
The problem is, I am unable to create any keyframe on the Facial Clip>Face track without my character's mouth reverting to the "L" shaped sprite at that frame. At this point the character is not speaking and should have a closed mouth, which she does until I insert a keyframe. This mouth shape is locked to the keyframe I create in the Face track, and cannot be moved or deleted independently. I can change the sprite back to the "Normal" position, but that will override all the mouth movements in the Voice Clip track, and the character will have a closed mouth for the duration of the scene.
I've included a picture of my stage and timeline. Could somebody help with this issue? Thanks.

Update: It seems to only happen before the first instance of dialog in the scene. It was slightly inconvenient, but I was able to work around it. Still curious at what's causing this though.