Scroll into view

Hi everybody,

I am having some issues with a cta arrow that clicks to the ‘top of the page’ on desktop, mobile and tablet mode, that is revealed halfway through the page and stays visible until you hit the bottom of the site. On Desktop everything is ok, but on mobile and tablet mode, about 50 pixels from the bottom it disappears.

If somebody can have a look. Maybe I am missing something.

Some help if possible

Here is my public share link:
(how to access public share link)