Extra menu background text showing on mobile

I am using the basic version of Catch Box but for some reason, when the site is viewed on a mobile device, I am seeing a lot of text about menus that should not be showing. This can also be seen when using the Firefox browser, but is invisible in other browsers. It appears that the error could be coming from the functions.php file. I have used Catch Box for other sites and not experienced this issue before. View issue here The view should look like this. But on a mobile and Firefox, it looks like this.