If you are or are going to be modding get a multimeter, even if your not get one, every person vaping needs one and they're cheap. Then you can check the batteries voltage and the atty ohms and know what your working with, makes troubleshooting and testing equipment much easier.
Also if you're going to be using lower ohm cartos/attys with a 14500 battery get a IMR battery. They have a higher capable current rating that's needed in the smaller batteries. Without specs of the equipment used I'd guess your current issue is you need a lower ohm atty.