I was not able to reproduce your issue. You set it up with a minimum height of 500, that should handle the page quite right.
I used the latest muse 2018.1.
Which one did you use? Watching in the browser it looked perfect, it may have some delay when using the scrubber in design mode.
I tried this in Chrome from Muse 2018.0. I don't see excess space between the last element and the bottom of the page. There's a slight change in the spacing between elements but nothing else.