The EAP300v2 may have come with firmware version 1.5.1 out of the box or was upgraded to version 1.5.1. The AP firmware must be upgraded to firmware version 1.5.2 to fix the bug.
EAP300v2 Firmware Release Notes:
Firmware version 1.5.2
Set SSID and encryption and save settings then after reboot, Site survey for SSID and encryption will not appear.
Add Green support in GUI, CLI and SNMP.