mine keeps popping.
That is to do with the wick job and probably spaced vs compressed coil? I space mine. Mine pops a bit if the wick is loose(ish) in the coil or if the cotton forms any type of fold (air pocket) rather than being perfectly round inside the coil. The cotton pads are prone to that if not cafrefully 'fluffed' because it tends to be a 'square' rod of cotton rather than a nice round tube and the corners fold when pulled through the coil. Mine has never done it enough to actually spit any noticeable juice out, but it does sometimes pop a bit. try to keep it nice and round inside the coil, and work it back and forth a bit to 'seat' it in there is all I can suggest.