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.
I already noticed that hash is different depending on the pool, the time you mine and also your distance (ping) from the pool.
But you're right, this difference is too big in your case. Could you please mine at different pools and report me the hash you get via PM ?
Is there still a difference right now ?
I use dwarf pool, for a day or two, the displayed hash rate is about 20% lower than usual. The mined XMR is also lower. My rigs are the same. It has recovered now.