Multiple H1

Various different systems are warning me that I have 2 H1 headings on most pages.
Granted that there might be the odd mistake, I have never deliberately added an H1, and have checked several pages and no H1 exist in the text.

I did notice that a similar post a couple of years ago got no response, so I hope someone can help!

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