iFrame embedded form does not show completely

As you can see on my testwebsite there is a problem with iframe, it doesn't display the whole form: 

http://www.operatorsgezocht.nl/solliciteer/

With kind regards, 

Hi,

I checked your embedded form against the form itself and both look the exact same:

If you wouldn't mind letting us know which portion of the form is missing on your end, as well as which browser you are currently using, we will be happy to have another look.