Last November I went to a wedding of a family member and for the table center they had mini white and orange pumpkins. Naturally I took one home because they're adorable and this past spring I decided to plant the rotting pumpkin that I left on the porch all winter hahah I just to see what would happen! lo and behold a giant vine started to grow at least 15 feet long with about three long stems coming off of it today I noticed that something was finally growing and it is not a white pumpkin! Is it possible that it was cross pollinated with something else or can different seeds get different pumpkins??? It's about 6 inches long

Seeds are like kids - they don't necessarily look like their parents. The seed from any plant is drawing on genetic material from all its ancestors. If you planted all the seeds in your pumpkin, there might be a white pumpkin growing plant in there somewhere. Or not.