Different retainer balance in the Clients and Retainers screens

User noticed that in the Performance tab of the Clients screen, the retainer shows a positive balance, but in the Retainers screen it shows as $0. Why is there a mismatch?

The Performance tab in the Clients screen shows the retainer balance of both the project and the client. It's the total retainer balance available from all retainer transactions. The Retainers screen shows client retainers only, by default. You can select a project in the Project drop down to include the project retainer.