Main menu disappears when the plugin is active

As the title says, my main navigation menu goes missing when i have the plugin activated.
I would like to have the feeds on the startpage, so what is the problem that causes this?

It looks really great exept the problem! 😉

Please help!
I use the theme “X” http://theme.co/x/

Best regards/
Frida

https://wordpress.org/plugins/wd-twitter-feed/