Had a 'error' show up as well today. Not sure what could have gone wrong.
Nothing is wrong, they do this intentionally. They take your actual deposited cash and use it as a bank float to earn interest for a couple of days. They don't have margin trading, so they can't claim that they don't have cash to cover withdrawals, when you sell a coin, someone has to have actual cash in their account to buy your coin.
The funny thing is that they are greedy over a few bucks. They earn about 1% of roughly $10 millions worth of transactions today alone, that is $100000. If they pay $300 average for their 20 employees (that number is probably high), and $4000 a day for office expenses, they would still make about $90,000 a day. That is at least $20 millions a year after paying salary and equipment costs, and is probably split between 2-3 individuals. Pretty good chunk of cash for a subpar service, yet they are greedy.