FVS318N Radio Channel manual config causes unexpected behaviour

On my FVS318N I have configured the wireless channel to use Channel 6 (2437 Mhz) as a manual setting. However, the Current channel reported by the GUI is Channel 3 (2422 MHz)

Any effort in making a manual channel configuration persist fails completely. I need a fixed channel setting as another wireless bridge has been configured to extend the network to a wired section.

Firmware Version: 4.3.3-6 (Latest)

below is part of the config file related to the Radio. Is this a bug in the fimware?

dot11Radio = {}

dot11Radio[1] = {}

dot11Radio[1]["path"] = "1"

dot11Radio[1]["dothMarkDfs"] = "0"

dot11Radio[1]["beaconInterval"] = "100"

dot11Radio[1]["txRate"] = "0"

dot11Radio[1]["opMode"] = "ng40+"

dot11Radio[1]["rtsCtsProtect"] = "1"

dot11Radio[1]["radioenabled"] = "1"

dot11Radio[1]["rtsThreshold"] = "2346"

dot11Radio[1]["dothEnabled"] = "1"

dot11Radio[1]["uapsd"] = "0"

dot11Radio[1]["txPower"] = "20"

dot11Radio[1]["cardNo"] = "1"

dot11Radio[1]["rogueAPEnabled"] = "0"

dot11Radio[1]["longRetry"] = "16"

dot11Radio[1]["dtimInterval"] = "2"

dot11Radio[1]["configuredChannel"] = "6"

dot11Radio[1]["interfaceName"] = "wifi0"

dot11Radio[1]["shortRetry"] = "16"

dot11Radio[1]["radioNo"] = "1"

dot11Radio[1]["band"] = "b"

dot11Radio[1]["xmlId"] = "1"

dot11Radio[1]["currentChannel"] = "2412"

dot11Radio[1]["preambleMode"] = "Long"

dot11Radio[1]["dothMaxPower"] = "30"

dot11Radio[1]["fragThreshold"] = "2346"

dot11Radio[1]["_ROWID_"] = "1"

dot11Radio[1]["rxDiversity"] = "0"

Appreciate your help and insights