I can't tell for sure from that screenshot but I'm 99% sure you have 1000.09 Immature because they are being staked. You basically have to wait for enough confirmations (should be done within 2hrs of when you got the stake reward) so it should be finished by now and you should have all the coins available again.

I'm guessing you are trying to setup a masternode and before you could do it the staking happened?. You will need to set it up so you have exactly 1000 again but then you should lock the 1000 coins so they don't get used for staking (this is providing you are setting up a masternode of course).