$ (window) .height () returns value equal to $ (document) .height ()

I have a very annoying problem.

I'm trying to get the "scrollBottom" page, using:

$(document).height() - ( $(this).scrollTop() + $(window).height() )

I then made a "tabelinha" to display the data on the screen, and tested on other websites (opening the site, and entering my code in the browser console):