Unable to get editor to forget Open Sans and use my desired default font

I used to use Open Sans but I changed to Roboto. I used Font Organiser plugin to delete Open Sans from the site, but Open Sans persists.

1. If I enter a new para between two existing paras of Roboto, the new para uses Open Sans.

2. If I view it in the Text Editor, the Roboto text is wrapped in <span> tags and the Open Sans text just has normal <p> tags. So WordPress clearly believes that Open Sans is the still the default font, even though I have used Font Organiser to delete it from the system.

3. If I try to change a section of Roboto Text to Open Sans, I can’t because Opens Sans is not listed in the available fonts. (as expected)

4. If I use the Visual Editor toolbar option “Clear Formatting” from the entire post, everything reverts to Open Sans, confirming point 2.

5. The only two areas where fonts are defined are in Theme Options -Styles Tab and the Font Organiser plugin. I have uninstalled that plugin in case it was competing with the theme. No difference.

6. I have hard cleared the cache

7. I have tried a different browser

8. I even tried a fix I found somewhere else on here, which added a css file and called it in functions.php but that didn’t work so I reversed it out

There’s an artifact setting somewhere. Grrrrr

The page I need help with: [log in to see the link]