Active clients show as 1 for every AP in the GUI Config screen
After upgrading to 9.21.12, the AP > AP Properties screen will show the Active Clients as 1. This is seen for all of the AP's. The Reports > "Clients by AP" report is accurate with the correct number of clients.
The AP reports the correct number of clients when looked at through the CLI, but is not being shown correctly in the AP Properties screen. This is a GUI issue and was fixed.
This is fixed in version 9.21.13 that has been released.