The gasket of the mouthpiece is placed correctly. When the IQ is off i don't have such problem.
Here's some examples, but first let me tell something:
- my IQ is really clean inside, there is no gunk or residue anywhere as i clean it every time I use it
- I use Sanyo batteries (10A - 3500 mAh as the IQ stock battery), so I don't think it is overheating
- I only have this problem when the unit is turned on, so when it's off it is closed correctly.
IQ ON:
IQ OFF:
I think the problem is the rubber grommet inside this chamber: it gets bigger in volume due to the heat and pushes the vapor chamber up.
try yourself different smartpaths and find what it suit you the best
or maybe the problem is with the grinding. try a coarser or a finer one.