this seems to be a common problem, a couple of my team had exactly the same happen to brand new bottles
we took them back to LIPS and they explained that they are made in a factory very close to the coast and sometimes tiny grains of sand get into the fill nipple sticking the small seal open when you fill them, therefore dumping all the air back out
you don't need to get a new one in most cases, just take it appart and clean the sand out
hope this helps
Ryan, team domination
Ill have a look into them maybe. Ill wait and see what happens with the micro ones 1st. Be a shame if i cant get it sorted.yes buddy, it's just a standard threading
the bob long fill nipples from LIPS are the best in my oppinion, they come with a threaded cover and a built in filter to stop it happening again