There's been many such signals detected over the years, the issue is that the majority of SETI work seems focused specifically on only detecting intentional com

There's been many such signals detected over the years, the issue is that the majority of SETI work seems focused specifically on only detecting intentional communication, i.e. high powered beacons set up to explicitly attract attention. That's why there's talk around whether the signals repeat, since they would in an intentional beacon that's constantly pulsing out a message. Of the signals that are captured that look suspicious, but don't repeat, some portion of them can be traced back to RFI, but the rest that don't have an explanation are just ignored since they don't repeat.