Let me suggest you go to this post for a great explanation on how payouts work:
https://steemit.com/steemit/@shenanigator/the-ultimate-guide-to-steemit-payouts
Given the recent price volatility, you could see changes in the actual payouts given the average used for the STEEM portion. In addition, I have learned from @brandonfyre that some applications also take up to 25% of your rewards if you use them to post. I see that you used dMania and that could be why you have this reduction as well. Here is a post that explains that as well:
https://steemit.com/steemit/@brandonfrye/top-6-steem-apps-stealing-your-rewards-and-3-that-aren-t
RE: Something is Wrong with Steemit!