Click the "SELL" tab, and display all.
Look at the entire Screenshot, I captured thr SELL tab, as well. It says: Currently, there are no sales offers. (Outstanding (0)). Or am I completely blind now? :/
I have used that site before and when your coins are seen as "reserved" it means that you've sold them but haven't released the payment (usually because you're waiting for the money to appear in the bank).
I have never had a situation where my transfer was confirmed and sitting on the "reserved" tab from the start. Check your mailbox. Are there any messages from the exchange?
It won't hurt you to contact the staff and ask about it.
Sorry, it appears I was the blind one, for some reason didn't see that part of the screenshot. But I still feel like it's due to a sell offer that hasn't completed (or you filled someone's buy offer). Like darkangel says, someone probably accepted the offer but you didn't release the bitcoins yet - similar to Localbitcoins. If you've already contacted support then you just have to wait... but I'm very sure there's something that hasn't completed yet. Maybe check all your transactions and check to see if they tally with all the Bitcoins you've deposited. Click all the individual txs and see their status.