Hey all so just got my 510 and just wondering about it. See it came with those prefilled carts. Isnt there suppose to be a piece of cotton stuffed in there? Isn't that what holds the e juice? I didnt see anything in there at all, just a small dot of some sort. Do I need to add something to it? Another thing... When it came in its sealed packaged. It was kind of wet. Once I pulled it out it was leaking all over and running down the sides. Is this normal? Will this always be an issue?