After the monero hard fork, I used XMR stak, but it crashed or more likely stopped GPU mining randomly. So, I switched to XMRig. Same result.Then used SRB GPU miner. It also showed 0 H/S found.
Only Claymore worked out.
But if I check the online stats in Nicehash, the projected payout drops to a value which is the value of CPU mining after a while.

What am I missing? I think there is some problem in my settings.

Thank you all.