It is probably staking all of it. did you have one transfer of your all balance at the same time to your wallet?
NO , I had my balance in several addresses , I had staked successfully before , 2 x , I never moved my coins from those addresses . At some point , we got all stuck at 71999 and no staking nor chain update took place .
I only updated the wallet and as I unlocked it once to see if that was the issue I got 4 new stakes that remain immature , 1 says confirmed 4of4 but immature , and 3 of them unconfirmed 3of4 2of4 1of4 and immature .
I have seen how my AC Balance: moved in some relatively swift steps towards the Stake: . All that time , I did not move my coins around nor anything else , I just waited & held so I could stake again , eventually .
Did you go to Debug > Console to run 'getpeerinfo'? Your connected peers are the ones who are going to get you beyond your current block. Perhaps you should do a backup of your wallet and delete & reinstall your wall app.