Fees for jobs that you have processed on clickworker.com are often not immediately available for payment. In “Payable” you can see what sums are currently ready for payment.
For quality assurance reasons this sometimes takes between 7 and 30 days (39 days for UHRS jobs). However, the account balance is added immediately after you have saved a job. The account balance therefore always includes completed jobs that have not yet been paid, whereas “payable” only includes the sums that have reached their payable date.
You can check your account history to see when the fees for a job become payable. As you can see in the screenshot, the job has been completed and therefore, booked on October 12th. However, it becomes payable 7 days later, on October 19th. On that day, 0.12€ were added to the payable balance.