Re: Avast says DNS queries on your device have been hijacked.
Avast can be a bit meh 😑 with this sort of thing and is not reliable with wi-fi scans. I had this problem for ages (with older versions) and just ignored it as I'd altered settings myself on my 2 router setup. It goes all "scammer" on you. However, that said, more recently they seem to have got their act together and this no longer happens.