I have always had a pressure guage mounted on a straight through manifold on my bottle with no problems but the guage was not facing where i wanted so i switched the manifold to a swivel type. used teflon paste on the treads like i usually do. turned it on then off and about 15 seconds later nitrous starts coming out of the threads. i have taken it off and on 5 times with no luck. what could cause this? never had a problem before since i use the paste.