I have been learning to fill vape carts lately. I thought I was starting to get the filling part down where the oil looked solid post fill with minimal bubbles but today when I filled the carts all of a sudden some of them filled with bubbles and overflowed out of the carts. I didnt have any bubble up out of the carts in my other batches so I have been trying to figure out where I went wrong. I was wondering if anybody knew a fix for this? Thanks.