The rewards people receive and the price of Steem are only loosely related.

The price of Steem is down because, amongst other factors, all the major cryptocurrencies are down against Bitcoin.

The rewards are down because there is more demand from the rewards pool.

It's explained fully here:

https://steemit.com/steemit/@penguinpablo/here-s-why-your-potential-payouts-are-going-down