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I see that you have embedded the jotform using iframe embed method here: http://braavos.com.br/
What I would like to ask you is to change the iframe embed code to this code (the same code you had used, with small alterations):
<iframe frameborder="0" scrolling="no" style="width: 100%; height: 515px; border: medium none;" src="//form.jotformz.com/form/42453494848668" allowtransparency="true" onload="window.parent.scrollTo(0,0)" id="JotFormIFrame"></iframe>
Usually this would be done automatically for you (the resizing), but there are conflicts on the page that do not allow the script that had followed the iframe to function properly.
Do let us know if this made it displayed properly for you now and please ignore the jumping of the jotform for now, we will handle this on the other thread for you.