Yes!! Same here. I
vape it until it's dry and then try to add more
juice and it just runs out the threaded end hole. Trying a Boge 510 for the first time, at least you can observe the filler! Seems OK so far.
The video says you can get maybe 5 or 6 refills before the carto goes south - how are the people with "You know, I bought one carto 2 years ago and it's still going strong, one puff and nobody in the room can see for the fog" doing it?