Im guessing you trapped some moisture in them. Unseal them and leave them in a very dry warm room for a few hours.
im not sure if resealing was proven to stop the fogging. but if you leave the cap off in the back and let the air circulate, it helps get rid of the fog.
correct me if im wrong
Me toIt works! I did that to mine and it doesnt fog anymore - it basically turns into a vent.