When you vote for the Steam awards you have to choose a game for every award to be able to submit it so people just don't care for some and put it any game they liked and enjoyed. Also, a lot of people probably don't read the award's name and just put in anything.
Because your didn't want to have all the stupid stickers. You need to vote for something to get them. So people who are just there for the stickers vote for anything.
Edit: saw in the comment before that the author mentioned you needed to vote for all to submit, and that's what you answered to. You are right. You were able to submit single votes.
Which pointed out to me just how little I care about award shows and competitions. The only thing that will come of an ironic vote is unironic positive press.