I think it’s not a real problem, set factory AP only reset allconfiguration(backup.bak) file to default value, AP sill keep some information likeAP reboot reason, rsm log and so on after set factory reboot.
To verify if AP set factory successor not, user can follow below items:
If config-mewlan is up or not
If the CLIlogin username/password is changed to be super/sp-admin or not
If servicewlan are all down and reset to default value or not