Old round stats, once paid, are purged automatically from the system to save calculation time for newer rounds. Most likely those shares were counted as invalid, as the rejection rate in the screenshot is already unusual high and are therefore not in the calculation. I see multiple payments to your address on that day - I can't check anymore if the credits where for that round, but the whole balance from that day would be something around 1 ZEC.
I'd still recommend not to use nicehash on PPLNS pools anymore or try nicehash on different/other pools.
Ocminer, I have NOT received any payment for that round. If you look at the timestamp, all payments made to my account where before that mining session.
I have already moved my mining to a PPS pool . I agree that PPNLS is definitely not appropriate if you a not able to mine 24/7.
BUT you cannot just dismiss my case with vague answers , when I am missing an estimated 0.6 ZEC from suprnova.
It's all in black and white. You are the owner of the pool, know the payout algorithm , and have all the tools to check why 240,000,000 shares have been gone !!