You did too much voting that resulted in diluting significantly your voting power, a mistake many new users on steemit make. Your voting power regenerates back to 100% over time, but you need to be more careful with upvoting things.

The problem is that you start with very little Steem Power and that means that your vote worth (how much value it adds to the post or comment you vote on) is very little. You can check the exact value here http://steemdollar.com/dollar_per_vote.php?name=rlziggy

So the more you vote, the less value your vote adds to a post or comment and as a result the amount you may receive as a reward from that post is getting lower too. The minimum you can get as a curation reward as a result your vote is 0.001 SP, you your share of the rewards is less, then you just don't get anything back as a reward.