Staking is active

But I still dont really understand how it works... Shouldnt I
get 0.8% daily?
I've staked for ~2h now (since block 21600) and suddenly got a HUGE amount
of coins (about 8% from Wallets Balance) and now it says that staking isnt active and
won't continue because the coins arent matured.
I can understand that the new coins need to mature, but why are my old coins suddenly
also immatured again?

Is this normal?

And if yes, can I now turn off the wallet again?

--edit--
Since the coins now moved from the "staking" field up to the available balance I assume
I am done and can turn off the wallet?
Thats all a bit mysterious, would be nice if dev could explain a bit more about this feature of his coin!