So today i was refilling soem carts using the plunger method. 15 drips in the cap. I plunged and absolutely nothing came bubbling out of the top of the cart but when i put the cart down there was massive juice leakage all over my tissue. I plunge using the mouthpiece end then stand my cart up on the battery end. I sometimes get a little drainage but never seemingly the entire refill. Does this mean the cart is just about finished?