The issue with staking is related to an issue with one of the first released wallets after the percentage change. If you tried one of the updates, such as myself early upon that specific release, coins were generating the incorrect amount.

The resolution is to either send those coins to another address or use the coin control option to combine all the nonstaked coins with a 35+ count into a new block. This will reset the day count and will restake under the new 9% rate.

As always backup your wallet.dat