HEADER ISSUE WHEN EDITING VIEWING MOBILE SITE (squarespace issue /* Hide prices on Squarespace Brine template - by Soundfocus Digita)

Site URL: https://porcupine-saffron-tdex.squarespace.com/config/settings/extensions

Hello there - started uploading product into our Shop yesterday and noticed after a short while the appearance of this bloc note when viewing the mobile version. It also appears for a 1/2 second when uploading the desktop version.

Would anyone know why this comes up and how to get rid of it:

Hi Paul, there is indeed a code inserted which was to help with a scroll down menu.

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script> 
  $(document).ready(function() { 
    // Add as many of the following line as you need (one line per folder redirect)
    $('.header-nav-folder-title[href="/architectural-hardware"]').attr("href", "architecturalhardware");
   
    
    $('.header-nav-folder-title').click(function(){
      window.location = this.getAttribute("href");
    });
  }); 
</script>

The above is different than what we had originally inserted.

The copied code in my question has only started showing up late yesterday and only seems to show up while we are in the store menu and reloading pages. 

Not sure if you can make anything of it. Much appreciated.

Thank you Paul - after further review - I was able to get the code off under Category / Advance / Page Header Code Injection.