^^^ What Papa said ^^^
Poor picture quality, so can only guess, but it looks like you are using WAY, way too much cotton.... and the coils are WAY too high. Your coils look like the bottom of them may even be ABOVE the AFC slots, which could be putting that much cotton in contact with the top of the cap/bottom of the drip tip. Lower the coils and less cotton would be needed to carry the joose, keep it away from the drip tip. Refer to the picture from pdib I posted in the Nuppin' thread of how to make the coil (on page 1)... and with the down leg (negative) length shown inserted gets the coil pretty close to perfect height. From the many posts and pictures posted there showing builds, most folks position the coil centered in the AFC slot, some lower than that, but I doubt many above the slot. YMMV