As long as you can pick up the jar by the lid, without the ring, you can consider it a good seal. You'll sometimes get little noises like that as the house heats or cools. As long as there's no oozing or mold, you should be good to go! 

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So the beans i found in the in-laws barn dated 95 but looks great clear water nice color are good to eat? I want to take them to be tested just to see, but they REALLY look good.As long as you can pick up the jar by the lid, without the ring, you can consider it a good seal. You'll sometimes get little noises like that as the house heats or cools. As long as there's no oozing or mold, you should be good to go!![]()
Just move them immediately to the fridge when they unseal and use them up right away. I would guess that it has to do with the air pressure changes.I'm a little worried - maybe some of you experienced canners can lend some advice? I put up a bunch of jams/jellies and pickles this year. All the jars sealed. I checked by pushing on the lid and also picking up the jars holding the rim/lid w/o the rings on to see if it was loose. A few times in the past few months, I heard a random "ping" or "thunk" from the jam closet and when I check, all the lids are still sealed and nothing is oozing out of any of the jars. Last Monday the hurricane came through here and I heard at least six loud thunks. I'm guessing it had something to do with the air pressure. Should I be worried? Is it normal? There's no way to tell which jars did it! They all appear fine.![]()