Lol. Errol, why? why??? Nah its not uncommon. I had this problem with protank and vivi before. Actually most of the tanks. dan is right on the condensation part. The other part is as I have said before, air pressure plays a part too, the more space, the more air. Sometimes there are air bubbles in the tank which may cause the buildup to push juice and shoot up into the drip tip.
If u fire it for a second without vaping, u may hear pop sounds, especially when the tank is 1/3 filled. Fire it once to pop the bubbles then take a drag. It shld be fine.