Probably too much cotton in the juice ports which means it's not wicking very well.
When you put the cotton in there should be very slight resistance when moving the cotton, but you shouldn't have so much in there that the coils move when you do so (too much cotton).
For the serpent mini cut the wicks over the o-rings, not the outside of the AFC, and fluff the cotton up at the ends... you should end up with something that looks like a bow tie. It will look like there isn't enough cotton, but trust me there is... juice everything up and carefully place the cotton in the juice wells but don't compress the cotton too much, you just want to make sure it's clear of the threads.
Screw everything back together and give it another try.