Thank you for your thorough explanation. I ran the command and here is the output
/interface/wifi/radio/reg-info number=0 country=Denmark
ranges: 2402-2482/20
5170-5250/23/indoor
5250-5330/23/indoor/dfs
5490-5730/30/dfs
5735-5875/14
I have read and understood your comment, but tbh, I am not sure how can I apply it. Do you have some specific recommendation for me what to try next?