Sorry I missed that you used trailing slash at the end of url, it should ismply look like this /#about

You can read more about it here:
support.themely.com/knowledgebase/setup-navigation-menus/

Also, this error can cause some incompatibilities, try deactivating all plugins except the ones needed by the theme and see if it works.

If the problems is still there, please share with me (temporary) administrator credentials to your site.

Thanks,
Piotrek