I deposit some decred into poloniex, but havn't received anything since then. And I found out that in the block explorer shows there's a unconfirmed txs balance. Is it the reason why I still have not received anything yet? If that's the reason what should I do? I'm kind of getting worry about this. The feeling of lost your money.
That's just a bug with the explorer. If you use explorer.dcrdata.org it'll properly appear. The transaction looks fully mined and confirmed.