The links for author, archives and calendar prev. months does not work. They send me to homepage. Can you explain me how this happens ? If we assume that the problem comes from polylang plugin, still the page for author or archives must exist, right ?
I hope you are well today and thank you for your question.
I have tested it on my test site and it’s working fine for me using latest version of Shapely theme.
I could confirm the issue on your site and this can be due to plugin conflict on your site so please try temporary deactivating all plugins and see whether everything works fine and then enable the plugins one by one to see which plugin is conflicting if any.