I got a 510 the other day, it's a 3 pc. For some reason the cart doesn't fit snug to the atty and juice leaks out around where they join together. It's keeps doing it even when the cart is almost empty. I don't hold or store it vertically either. Is this normal? They are all pre-filled carts that came with the pv and don't seem overfilled. Should I just ditch the carts and get some cartomizers? Or should I contact the supplier?