Footer widget on mobile

Hi there, and first of all – thanks for a cool theme.

It has been fairly easy to use, but some time after going live with a site, I discovered that the footer widgets are on top of each other in mobile browsers (i mean really on top of each other, on the same line).

That doesn´t look good at all. Is there an easy way to fix the responsiveness so that one of the wigets moves under the other one?

Here´s a picture to show you my problem:
image link

edit: typo