seckert22, The problem with your deck of cards could be a number of things. Humidity in the region where you live, oil on your hands, care of the deck as it was delivered to you, temperature in your home.
I know this sounds ridiculous but if the problem is humidity in the region of the world where you live then take your deck of cards and stick them in the refrigerator with a new box of baking soda sitting directly next to the deck. Make sure the deck isn't sitting on or near anything moist in the fridge. The baking soda will pull all moisture out of the deck that may be there.
If the problem is temperature in your house then keep handling the deck of cards until they warm up. You can also stick them in your pocket to warm them up quickly. A cold deck of cards will not spread, fan, dribble or spring the way a warm deck will.
If the problem is oil from your hands getting on the cards, First wash your hands. Second, faro shuffle the heck out of that deck of cards to spread the oils over the entire card not just in the areas where you have touched.
If the problem was care by the shipping service who delivered the package to you then the only thing you can do is faro shuffle, spring, dribble and anything else you can think of to break in those cards.
If I had to guess with the time of year the cards are just too cold and need warmed up. I doubt it was oil on your hands because I run my hands through my hair constantly even while performing and I get hair product and oil from my hair on my hands and I still handle my playing cards without washing my hands and I have never had a problem with clumping playing cards.