Can anyone help me with this problem with columns?

I have this wordpress online:

https://www.espacioeclectico.com.ar

Suddenly, when I open it in my computer at work, i see it this way (only in one computer and with firefox):
https://espacioeclectico.com.ar/wp-content/uploads/2015/07/captura1.jpg

When I go to internet explorer I see it correctly:
https://espacioeclectico.com.ar/wp-content/uploads/2015/07/captura2.jpg

I don′t know how to fix it or why this happend.

Thanks