First of all, a click isn't that big of a deal, but I totally get if
A lot of factors can cause a click. Humidity is probably the biggest culprit though.
To fix it, try this:
- Shuffle the deck pretty well. Then Riffle Shuffle the cards into each other half face up, half face down. If possible, Faro them
- Put the cards back in the box
- Put the box in a card clip. If you don't have one, put them on a hardback book or a flat surface, and put another hardback book on top. Try to get all 3 centered on each other, but it's ok if they're a little off. Stack a bunch more books or weights on top
- Leave it for a while. 2 or 3 days, maybe even a week or 2. The longer you'll leave them, the better It will (probably be).
If you do have a card clip, use it to carry your deck around if you want.
Also, you may want to store your decks in a dryer place. I suggest going to Walmart or whatever and buying a container with a lid, the kind someone's grandma might use to store sowing supplies (not including those Danish cookie boxes). Nothing expensive, just a plastic box the size of a shoebox with a plastic lid that snaps on pretty nicely.