Go to:
Settings --> Options --> Reserve (enter the amount you wish to prevent being staked.)

After reserving you may have to wait a while until you see your coins 'unstake'.
There's a possibility rebooting your computer could speed up that process.
However you may simply need to wait till the next block/stake payout.

It is in the nature of the design of the PoS- Proof of Stake system (which many coins use)
If ones who are speculating on exchanges to put some of their coins back
in their wallets and stake them things would happen a lot quicker.

It works like this:
Coin minting/Blocks are generated through staking (as opposed to PoW where blocks are generated through mining rigs.)
The more people that stake the faster the blocks are generated.

In other words, in order to support the KORE network, enough people should stake otherwise there will be these delays.

The best thing Everyone even Speculators could do is Support the KORE Network and Stake a Portion of Coins
so it would only take a matter of minuets to unstake coins.

Hope this General Overview helps. There is nothing wrong with your wallet.