Hi, I'm revamping our company website at the moment but I've hit a strange issue that I have never seen before.

Take a look at the 2 attached images, the first is of my site locally.

The second is the site live.




There is a sizing inconsistency, I'm not sure what's going on but it only happens in firefox.
The site is live here

Anyone able to shed any light on this for me?

Thanks