What model of controller and firmware version are running? Is there anything in /var/log/ap/(id#)/telnet_cmds for that controller? Typically we expect to see a login, config push, and then accept/reject of the config before a write mem.
To get ID number, navigate to controller's monitor page, the URL will have the ID number.
example:
amp.name/ap_monitoring?id=123
This logs to /var/log/ap/123/telnet_cmds