The network (we/your wallet/bittrex) saw the last PoW block from the pool on fri 30th Mar 2018 10:07:08 UTC (block 936107) more or less. From what you can observe the pool is not able propagate his mined blocks (maybe the same issue as in the miningpoolhub case) and not accepting any PoS block from outside (his own chain_trust is probably higher than ours). Once the pool owner restart the node you will see your coins. If the pool owner resync the chain first and will continue mining after you'll never see your coins because you mined on f*rked pool (of course if you send shares before the f*rk, coins will show up at the pool wallet and will be resend else if pool owner will refund from his owns). This is my observation only, i know sh*t about politics background or how to code a coin from the scratch.
edit: since mon 02 Apr 2018 22:09:23 UTC (block 937515) we've PoW blocks in chain by anon pool/miner