Their faces are always like that in non-cutscene. But i hated how in KH2 their faces would change and become weirder when the camera wasnt really focused on the character.
Not a glitch,this is a special thing they added that happens in many worlds.Such as these:
Deep Jungle-If you beat Deep Jungle before finishing Wonderland,Snow White will appear instead of Alice.
Monstro-If you seal the Hollow Bastion keyhole before you finish Monstro(Before you meet Riku),there will be a new scene where Sora meets Riku-Ansem.Also,now Riku wont fight with you against Parasite Cage.
Neverland-If you skip Monstro and go to Neverland,some of the Neverland scenes from Monstro will be here.