Your hashrate is only an estimate. It goes up and down all the time. It only matter how many XMR you get at the end of the day.
As the global hashrate of Monero is less that some days ago, it is a good time to mine and hold.
If I switch my dev farm to
http://dwarfpool.com I get over > 17 khs. If i switch it back to monero.crypto-pool.f, 12 khs. It normally sits around 17khs for your pool.
I do understand that its an estimate, but that is a BIG difference.