I bought 2 jars of pumpkin seed butter from Amazon a few weeks ago. They were individually wrapped in bubble wrap. One was opened immediately...the second stored on a shelf.
When I took it down and unwrapped it, it was upside down and oil had leaked out. It also opened quite easily with no pop. Not that I've noticed an obvious pop before. Did the escaping oil loosen the lid? Ok to eat?
Ermm - when I get a new jar of anything - my strength isn't good so I just release the air by sticking a knife in - and pop it goes - have been doing that for years.
didn't get back as I was in bed - contents remain fresh enough CBL as usually I can consume in about 3 weeks. Right enough I'm talking about tiny pickled onions.
When I don't think about it I don't buy many jars - beetroot and onions would be it.