No – I do not see any errors being reported as such. Basically you have something going on there that is redirecting all of the url requests to the main forum front page. The urls being requested are all correct but redirection is taking place.
If you have deactivated al of the other WP plugins and this is still happening then you may need to ask your host why this is. Most often it is another plugin. The plugin ‘Permalink Redirection’ for example may do this. The ‘Yoast SEO’ plugin can also do this.
I see you are running Jigoshop. I believe – although I am unsure if this is still correct – that that has caused some problems in the past just not sure what they were.