Panther mouth slightly open sometimes?

Hello people of the forum,

I own a panther chameleon that sometimes has his mouth very slightly open on the sides. It doesn't affect him when eating, but online, it says it could be MBD in the jaw or a UVB problem, but I don't think so. He eats hornworms, silkworms, crickets, and butter worms (Ordering dubias), and seems healthy. I have a 5.0 UVB Zoo Med, and a 100 watt Repti Basking Bulb. Any ideas what this is?
 
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