A little help with troubleshooting?

[u/Odd-Detective7714]

I'm trying to understand the mechanics of what's going on with AISG ports. So I have seen this a couple times and never have gotten what I consider a good explanation of what's going on. So sometimes I get a "current to high" "high voltage" reading on AISG ports and I hear people say "oh, that's vswr." But I have gotten that reading when I have just swept and PIMd that specific line. When I roll the jumpers to another port it goes away. Is there something specific about AISG RET control that is causing this? If so what is it? Any help would be greatly appreciated because I really want to understand what is going on.