If you're going to use them for vacuum sealing warm them up before you use them.
I use an old heating pad that I have a tea towel on. I place the lids rubber side up and then cover with the remaining towel. I set the heating pad on low. That way I have time to get all the stuff ready for vacuum sealing.
Works for me. It softens the rubber to make a good seal
This also works with those lids with rubber gaskets from spaghetti sauce or pickle jars,etc. Soften the rubber, place the lid, place the jar inside a vacuum canister larger that the jar and vacuum seal. It works lol