Tips with small holes through which vapor escapes allow liquid to pool around the underside of the hole, eventually collecting into a drop that clogs the hole and spits juice in your mouth on your next inhale. This is worse with thicker juices as the drops have greater surface tension. The hole in a drip tip is too wide for this to happen. Instead, vapor condenses under the lip of the drip tip and around the barrel of the hole. Any that condense into a droplet just slide back down.
makes sense but not what is happening in my case, I'm looking at the juice puddling on top of the donut ring, which doesn't really make sense as it should be dripping back through the hole and onto the coil.