Because payment is only on your deposit wallet, but not forwarded to the Hotwallet.

Watch it here:
https://blockchain.info/de/address/1HWqsgnSd12Gv8SpoUMi1Cj8hp79BTSpW7

Already 13 pages unconfirmed transactions.
As long as nothing happens here, no one gets his deposit.

In reality, these transactions are guaranteed already confirmed, but it is just not yet in the database of blockchain.info
Cause they fucked up something, hehe.
http://www.reddit.com/r/Bitcoin/comments/38x00y/oh_no_not_again_blockchaininfo_ndbclusterfuck/