Hi,
Doesn't look like anyone else has offered any input. I can't say for sure that there isn't anything wrong with this behavior, as I'm no expert, but I can say that my 2 jungle carpets do this sometimes too. It's the same behavior as starting a shed- rubbing the nose and side of the head, but happens outside the shed cycle. I don't understand it but they seem to do it from time to time with no ill effect that I'm aware of.

Great looking snake!

Josh