Footer widget displaying incorrectly

I have set up a wordpress website (my first) using a theme called Auberge.
I’ve used the theme’s footer widgets and I’ve added jetpack widgets.

On PC (I’ve tried Firefox and IE) the footer displays incorrectly on the front page; all areas are on top of each other in the first column, and it extends out of the footer downwards. There should be 3 columns.
It displays fine in the “customize theme” view, however.
The footer works fine on my other pages, just not the front page.

Everything works fine on iphone and ipad, including the front page.

I’ve tried removing each footer widget, but the problem remains.

The website is: https://www.anderschriss.com
Anyone with an idea on how to resolve this issue?
Thanks.