Why is IE 10 the only browser that displays the Header right?

When i use Chrome and Firefox, the Header of theverge.com always is broken in two. This was also the case with the old design.

When i use IE 10, it looks just right.

I tried to decrease zoom and font-size, it didn't change anything.

Suggestions?

Here are some Screenshots:

IE:

Chrome & Firefox

I think the reason for this is also causing this: