Yes this looks normal. I guess the question I have is what problem do you think there is? Is your gecko acting normal? I have 3 leopard geckos. It is smart that you used a paper towel to make sure there is nothing wrong with them. I always do this when buying a leopard gecko. Usually, I have more white in the poop which shows their calcium. I make sure I do it every feeding. Also, I dust their mealworms too, but remember this is fatty for your geckos. Are you dusting the crickets? I would like to know how old your leopard geckos are.