Error with Video in Tabs element

Hi BlueOwl,

I enter the following code:
[tabs tab1="MASSPHONING - The Tool" tab2="MASSPHONING - The Concept"][tab id=1]<iframe src="http://player.vimeo.com/video/76261768?title=0&byline=0&portrait=0&color=ffffff&autoplay=0" height="720" width="1280" allowfullscreen="" frameborder="0"></iframe>[/tab][tab id=2]<iframe src="http://player.vimeo.com/video/76261768?title=0&byline=0&portrait=0&color=ffffff&autoplay=0" height="720" width="1280" allowfullscreen="" frameborder="0"></iframe>[/tab][/tabs]

WordPress renders:

<iframe src="http://player.vimeo.com/video/76261768?title=0&byline=0&portrait=0&color=ffffff&autoplay=0" height="720" width="1280" allowfullscreen="" frameborder="0"></iframe></div>
<iframe src="http://player.vimeo.com/video/76262044?title=0&byline=0&portrait=0&color=ffffff&autoplay=0" height="720" width="1280" allowfullscreen="" frameborder="0"></iframe></div>

But when the page is loaded, the result is:

<iframe frameborder="0" allowfullscreen="" src="http://player.vimeo.com/video/76261768?title=0&byline=0&portrait=0&color=ffffff&autoplay=0" data-aspectratio="0.5625" style="width: 578px; height: 325.125px;">
<iframe frameborder="0" allowfullscreen="" src="http://player.vimeo.com/video/76262044?title=0&byline=0&portrait=0&color=ffffff&autoplay=0" data-aspectratio="0.5625" style="width: 300px; height: 168.75px;">

Which renders the video embedded in the second tab smaller than the one embedded in the first tab.

Could you give a hand here?

Thanks in advance,

Javier