According to Google Search Console Live Test on https://www.energycouncil.com.au/ returns text that does not exist on the viewable website.
Why is completely different source returned when using the Google Search Console with a Live Test?
I worked it out.
Code had been injected into a source code file that redirects the site if it is a website indexer. Ingeniously, this code did not do anything for over a year so I didn't see the issue as no files appeared to be recently modified.
To find the issue, download the live site and search it for "redirect"