. If your staking age is more than 30 days, that block will NEVER stake... resend it to yourself to start staking again.
How can I determine how old my staking age is?
Go to Settings -> Options then under the Display tab, click the "Display coin control features (experts only)" checkbox. Click Ok.
Now you will see a new section in "Send Coins" called "Coin Control Features".
Click "Inputs..." and you will see a list of your addresses and coin blocks.
Along each block, you will get some information such as confirmations and the date.
Now, you can also set a "Change address", so whatever change left after your transaction will go to an address of your choice instead of going to a random address.
To see some staking statistics, click Help -> Console Window, then under the Console tab type "getstakinginfo".
The network weight now is 146 million and the difficulty is 1.86. This network weight is the total number of confirmations done by staking wallets. Once they get a stake, the network weight will reduce and the difficulty will decrease giving your more chances to stake.
The ExpectedTime is an estimate of your next stake in seconds. Use the calculator and divide it by 86400 to get the waiting time in days.