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When you say twitching do you mean that it's jumping around like moving to the top after every selection? If so, you can add nojump parameter on the URL in your iframe.
<iframe id="JotFormIFrame-62523476946364" onload="window.parent.scrollTo(0,0)" allowtransparency="true" src="https://form.jotformeu.com/62523476946364?nojump" frameborder="0" style="width:100%; height:347px; border:none;" scrolling="no">
If problem persists, please let us know.
Спасибо! Это помогло.