I looked a little further into what was causing the issue and decided it was better to switch to another plugin. Unfortunately, I still have the problem even after removing Super cache. Now it’s swiss cheesed.
Will have to work on this for another hour; but luckily i found a better plugin with less headache than super cache. (btw they mention this bug occurs, so they know about it and it is super cache, not any other plugin. I shut them all off, removed ones I wasn’t sure about.
I even ran tests on a bunch of the options, over and over and nothing yielded consistent results; for example, Chrome wouldn’t show images and content properly. I checked on my mobile as well.
Thanks for your advice on backups, I will see when I get some more time to do that. It will be worth it to learn to run a backup test site.