Hello I recently purchased a five pack of these and found that they leak e-liquid a lot. So far I have filled two of these with e-liquid by using a syringe and I am very displeased with how much e-liquid leaks out of them. Just after filling, it leaks from both the top and bottom end. I only filled with about 1 to 1.5ml, even though the item description states that it holds about 2ml of e-liquid and would guess that close to half of the amount of e-liquid ends up leaking out. Is this normal? Have you had prior complaints about leakage issues on this item?