ToweKnee is dead on with this, there could be several problems. VG juices are more viscous (thicker) than PG juices, this will cause wicking problems with certain carto's due to the holes being a little too small for the VG juice to properly wick the carto. If you did the holes yourself did you punch them or cut them? Punching is the way to go IMO. If its pre-punched what brand is it? More info please.
Might be the eliquid's too thick but also does your tank screw down all the way onto your mod? Sometimes I'll have to use an adaptor on some mods where the tank screws down totally flat onto the drip-catch cup, not allowing any airflow.
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