Staining your deck isn't the most straightforward assignment as there are loads of things that can turn out badly during the entire cycle. It very well may be that you applied your stain day on a day where it rained later on or you might have over-applied the stain, which left it sticky. Give the deck around an hour to truly absorb all the stain and afterward go over it with a wipe to dispose of any abundance of the excess stain.