Is it a new atty? I got a V12 Prince a couple of months ago that had been over machined ever so slightly but caused the juice to spill out of the airflow holes. I put some teflon tape around the coil just to make sure this was the problem and it stopped the leaking but I was not going to vape with a coil heating up teflon tape. I got the atty from eBay and they refunded me without me needing to return the item so I had a box of spare parts instead of an atty..
I remembered having the same issue with mine when I first got it, if you set the wattage too low you will have leaking issues, also check the o-rings and make sure the coil is tight enough. The only other thing I can think of is making sure you are using max VG Juice