Updating 5GHz wireless settings overwrites 2.4GHz settings, but does not save in 5GHz tab

[Juggerbot]

I have an Asus RT-AC56U router, with an N 2.4GHz network and an AC 5GHz network configured.

Whenever I change the settings for the 5GHz network under Wireless-General, such as the SSID, Wireless mode, etc., and apply the settings, it will refresh onto the 2.4GHz Wireless-General page. Going back to the 5GHz page shows that none of the settings were saved.

Additionally, this will overwrite some of the 2.4GHz settings, such as the name and wireless mode. If I change and apply settings under the 2.4GHz page, they will stick, unless I go back to the 5GHz page and apply any settings there again.

I have a video of the issue here, as well (ignore the displayed time, actual video is about one minute long): http://w.webms.org/m/7A1HQCFT.webm

Here I change and apply the 2.4GHz settings, and then show that they are saved. Then I go to the 5GHz settings, change and apply, and then show that it refreshes on the 2.4GHz page (note the drop down menus), where the previous settings were overwritten.

I've tried searching for other reports of this issue with no success, although maybe it's not worded accurately.

I first noticed this under version 378.51 of Merlin, and as of the latest (build 378.54_2) it is still an issue. Thanks for any help!