AC68U wireless issue

[yavera]

I have a new AC68U Asus router and I can't setup different SSIDs for 2,4 and 5Hz. If I setup a different SSID for 5GHz and different password, after 5-10 seconds the router it's saving again the setting and making the same setting for 5Hz as it is set for 2,4Hz.

Did I did any setting wrong? I've tried 3 firmwares: 374, 376 and 374merlin
In all cases it's the same issue.
I've also did reset to factory defaults.

Any advice?

 

[john9527]

If you are using a 'password manager' addon in your browser, turn it off for the router web pages.

 

[yavera]

Thank you very much
I had password manager(LastPass) on all 3 browsers.
I was going nuts.
Did reset and configured the router 2 times