Few things are wrong with the site survey. #1 your running 80Mhz not 20Mhz, 2. Channel is wrong, 3. 802.11 an isn't a thing.. might be helpful to know what wifi protocol types your running such as legacy(b,g)/n/ac/ax.
What I suspect maybe happening it it's possibly reading a guest network you have running or your not capturing any data collection.
https://www.asus.com/support/FAQ/1032598/
If you have a computer I recommend using WinFI as it will give you a far better survey then wifi radar can. Note that in order to see all possible channels your wifi adapter needs to be set to mixed mode on 2.4Ghz and 5Ghz or toggle between the different modes n,ac,ax ect..
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