Error with my site when viewed on a mobile device, the html seems to keep getting a :before issue

For some reason when I use my website on a mobile device the stucture keeps on changing, although everything seems to be working fine, my menu button works, but if you try to scroll

I thought it might be a problem with the js but it doesnt seem to be

you can see it on https://diegoasgportfolio.com/lapizzeria/#