I've been submitting shares to suprnova nonstop, my client says i submit shares and suprnova shows we have found blocks, but my earnings show 0 and transactions show a huge dip when blocks were found and shares submitted, but i got nothing.

2017-08-07 18:18:49 <- reward
2017-08-07 18:35:15 <- reward
2017-08-07 19:13:24 <- next reward, but i was mining and submitting the entire time

Looks like a lot of shares have given me nothing. Stolen?