Volcano bag problem

Hi. figured id start a new thread for this. When i suck all the air/vapor out of my volcano bag for some reason if i go back to the empty back 5 mins later it has a little mouthful of air in it ... i thought it shouldnt fill at all on its on... or is this normal? and when the bag is full of vapor, if i sweeze the bag , a tiny stream of vapor will come out the end of the mouthpiece (where you suck) even if the mouthpiece is not pushed in to let air out....

hmmm never squeeze my bag...but I do have to tell u this...I revaped much cannabis today on 7 and it hit better..."revape" not first 5 bags

lmao they sold u a lemon

that happens to mine aswell i cant explain the air getting in but i know that the part that you pinch to put on and take off the pieces also acts as a vent to let out excess vapor so your bag dosent get too full and pop