Well, no, it happens with all tips not just the one that give me vacuum seal. I do have an ety er4s and a brainwavz b2 - you don't get any more of a vacuum seal than those and I have never had issues before. Also its just the left piece - I put the left piece in my right ear and the right piece in my left and the left piece does the same, so its not from my ear but from the left piece.
edit: It's probably an issue with the driver in the left housing. Anyway, I don't want to scare anyone - malfunctions and issues like that occur with way more expensive headphones in very good packages and what we have here is a $20 iem in a plastic bag, so its not a biggy. I just ordered a new pair from another seller on amazon (I'm not saying that the one I bought it from is to blame or anything).
Edited by kova4a - 10/31/12 at 5:15pm