Ok but 20/40/80 Ceee will be good?Yes, now the settings are correct. If it still goes wrong, try changing the width or channel (frequency).
It will be ok?Turn off auto frequency. Select fixed channel, e.g. 5180 MHz.
Don't use 802.11a mode if you don't must. Set n and ac.
This is my 5GHz configuration: https://postimg.cc/gallery/1rjz2x9u6/Bring it further away. Try other wifi frequency in settings. Make sure you have all 3 chains enabled.
Ok please look: https://postimg.cc/gallery/gp0j4kvw/This is not a reliable way to test anything, but in any case, make a screenshot of the connection information in wireless "registration table" when you do this speedtest. So we can see the signal and noise data.
I don't have other 1Gbit computer.How did you get that speed? Try iperf3 between two computers, instead of simple file copy.