Nicehash!

I'm mining on here with hash from NiceHash. usually with order profit +5,+10%,.today I lost 50%!!!, what is the reason? how could this happen? The order was the same speed as always and with the same settings.

The order speed was the same, but was the duration? The cost may be higher today at NH, profit lower at PH, or both. You can't really expect to get arbitrage profits like that forever.

mining is gambling, you will not always make profit

I understand, but the order is completely fulfilled. And that would be -50% that would be the price of scrypt for 5 hours was
0.00001600 BTC, and this was not this day!