He shouldn't be away from his mother or litter mates, he is way to young. In most states, it is illegal to sell them until they are 8wks old. So I hope he didn't cost much, he could cost alot later
Anyway to anwser your question, his ears will do all kinds of things while he is teething. They can go up, down, sideways, one up and one down, etc. My guess is since you got him from such a good breeder, anything is possible.