I've run into an issue with my sprites and I'm not sure what's going on. I've created my own mouthchart with sprites for both 'happy' and 'sad' versions. When I do the lipsync though, some sprites are displayed correctly while others are way off. Below you'll see that the lipsync calls for the 'm-s-mbp' sprite (which is the closed mouth 'm' sprite), but it seems the 'M-S-L' sprite (L mouth shape) is being displayed instead. Any idea what could cause this mismatch of sprites?