If that continues, i would suggest taking him to a vet that specializes in reptiles, to get a profesional opinion on whether there is a problem or not. Fingers crossed everythings alright
same thing happened to me when my veiled was younger he would ignore mealworms no matter what i did, so i tried feeding him waxworm which he went straight for and loved, after that when offered mealworm he pretty much went straight for them. Every cham is different i suppose. I'm sure he will...