That test was done on my Desktop.I just re-ran the test, i always do it twice as first pass it generally misses all the style sheets and scripts.
For a better test, open the page in Chrome > Right Click > Inspect and look for the Audit tab ( it may be hidden in the 3 dot menu ). Run that for mobile. It will provide a much better analysis of your site.
No errors or issues. The mobile friendly tool is just bad at gathering all the stylesheets and scripts. Its very hit and miss.
Back to your original question regarding Navigation being read twice. This is because the Theme is responsive it Loads the Destkop and Mobile menu and hides them for each device type. Again this is not an issue.