Question How to use a new cable tester?

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Can you tell me more about this. This is something for me to look at that I've never heard before.
Non-UniFI switches confuse the network management app. If you are using the topology view to determine the wireless uplink, then the management app may be misleading you. If you look at the UniFI devices view, what does the uplink column for the APs show?
With non-UniFI switches, it is quite possible you have no connectivity issue, but the management app is not able to correctly interpret your connectivity.
 
So much weirdness. Just swapped the cables on the other AP. Loading up unifi software, all three register as mesh now. The two that were up and running before are now adopting on their own. I'm going to check out this stuff on the network management app related to having switches in the system that aren't unifi.
 
Non-UniFI switches confuse the network management app. If you are using the topology view to determine the wireless uplink, then the management app may be misleading you. If you look at the UniFI devices view, what does the uplink column for the APs show?
With non-UniFI switches, it is quite possible you have no connectivity issue, but the management app is not able to correctly interpret your connectivity.
That is where I always look (whether that is the right place or not?) That is where I always check for whether I am mesh or Gbe. The data I see in the software seems to report that almost all of my traffic goes through the Gbe device, which is the newest device, and also the farthest from typical use. I put it in a dead spot I had with the other two AP's. One is in a teenage daughter's bedroom, one is in my work from home wife's office. I put the newest one in my my bedroom to get a signal to my other teenage daughter's bedroom as I couldn't get a direct cable run to her bedroom.
 
With the new cables swapped in, I'm trying the suggestion again of dropping the two meshed devices with new cables replacing the flat cables, and turning off meshing. I am able to do this. I am waiting for the two dropped AP's to pop up again, or I'll go reset them with a pin and see if I can get the back up and see what happens with meshing if I can find them again.
 
If I can remove one of the switches, is it worth trying that? I have one in the office (the oldest switch) in case something needs to be hardlined in there, but so far everything runs wireless anyway.
 
This is what I get. I looked in my screenshots to find this quick. I actually found this image, the exact I just screenshot, along with a bunch of similar screenshots from last June. Same issue, no solution yet. I also have a screenshot of all my my ap's in Gbe mode at the same time. ???
 
This feels like where I need to cable test. Can anyone help me with now to use this cable tester to find if there is anything wrong with any of my runs now that I have replaced the small flat patch cables with solid ones from Monoprice and found the problem persists?
 
Now I can't get the other AP's to connect at all. When I try to adopt them it says a wireless uplink can't be found. They are just stuck not working with the option to adopt them, but they can't adopt.
 
Sorry, three boxes on the top half are the ap's.

Internet into the house, then into the router then from there to two other routers so that there are enough splits for the home theater setup and the rest of the house. Each bedroom and the office has its own AP. The one running over coax is currently showing as Gbe. Typically if I forget that one, and adopt one of the others first, it will show up as Gbe instead and the other two will mesh off of it.
 
Currently the three aps are all reading as on different 2.4 channels. Typically this is not the case. Typically at least two are on the same channel and one is on a different channel. Channel 1, 6, and 11 right now.