I think it was a post by @dustsweeper that said they had problems with upvotes on the seventh day. They went to the 6th day, but now seem to upvote on day four.
I tried looking through the FAQ page for the exact cutoff. SteemIt is not well documented.
Looking at your Cards Against Humanity Week 10 post
It looks like most of the contestants didn't get anything for your upvotes: The picture shows your upvote and the payout is $0.00
Of course, in this day of ever declining STEEM, it is hard to keep an upvote value over $0.027 ... which is what dusty says is needed to secure a payout.