I hear that question over and over, unfortunately there is not static reason for cartridges not wicking into the atty. When i am in person with someone and they ask that question i take their atty off and have them blow it out into a napkin and almost every time the atty was so full it was either flooded or close. The problem wasnt' that the atty was dry and not producing any vapor it was flooded and not producing much vapor so they kept topping off and topping off and topping off trying to get more vapor. This may not be you but you can find out if this is your problem or not by taking the atty off and blowing it out with your mouth into a napkin until no more fluid comes out. Then take an old cart and pull the stuffing out and put it in the ecig and vape. You should be able to vape at least 5 to 7 toots just on the fluid left in the wick. Once you do get reduced vapor and/or bad tasting vapor top off a new cartridge (and i mean brand new). When topping off a cart, the top should look like a slushy and not a pool. If it looks like a pool, blot it with a napkin until it looks like a slushy. Put in in, wait a few secs for it to wick into the atty and vape. Sometimes you may need to swing the cig (holding by the atty end) to force some liquid down into the atty by centripetal force. Also, after several times of topping off a cart, the filler can become compressed by contact with the bridge (wick inside the atty) and not make good contact. At that point either use a new cart or check out this and other forums for help on restuffing a cart.