Wordpress site won't scroll

I made a few changes last night to my site, mainly to do with lang tags using hreflang tag manager plugin.

All of a sudden and I'm not sure when it specifically happened, normal users are now shown the wordpress admin bar and also the site won't scroll on desktop.

I have fixed the admin bar problem by following this (http://www.wpbeginner.com/wp-tutorials/how-to-disable-wordpress-admin-bar-for-all-users-except-administrators/) and adding code to functions.php

But I am completely stuck as to why the site won't scroll on all browsers on my mac. It works fine on my android phone.

I even restored the whole website from a backup from days ago but this didn't solve the problem. Any ideas as to why the site won't scroll?

Thanks in advance.