Website shows elements in different places - same browser - different machines

I have this website that I'm making for someone (immo-deal.be) and it shows certain elements in different places on different machines, but the browser being used (IE 8.0) is exactly the same.

I don't understand how that is possibl开发者_高级运维e? Anyone have an explanation?

Main element that moves is the flashing text moves up and bottom grey text moves up too.

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Maybe the browser resolution is not the same on the both machines and there are HTML block elements floating in a container without a width or with an extremely wide width.