Weird Css in WordPress Backend Menu Area

[ Moderator note: moved to Fixing WordPress. ]

So when I am in the Appearance>Menus areas, basically half of the available options for adding to the Menu are gone. When I inspect the CSS the following is there:

.hidden, .js .closed .inside, .js .hide-if-js, .js .wp-core-ui .hide-if-js, .js.wp-core-ui .hide-if-js, .no-js .hide-if-no-js, .no-js .wp-core-ui .hide-if-no-js, .no-js.wp-core-ui .hide-if-no-js {
    display: none;
}

within the style sheet: myurl/wp-admin/load-styles.php?c=0&dir=ltr&load%5B%5D=dashicons,wp-jquery-ui-dialog,wp-pointer,admin-bar,common,forms,admin-menu,dashboard,list-tables,edit,revisions,media,themes,abo&load%5B%5D=ut,nav-menus,widgets,site-icon,l10n,buttons,media-views,wp-auth-check,wp-color-picker&ver=4.7.3

If I comment out the attribute then all of the other options appear. This is frustrating. Any ideas?