Embedded video duplicated after editing

<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/I4S2Gu7ZDT0&hl=en&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/I4S2Gu7ZDT0&hl=en&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>

<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/I4S2Gu7ZDT0&hl=en&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/I4S2Gu7ZDT0&hl=en&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>

<p>
   <embed allowfullscreen="true" allowscriptaccess="always" height="344" src="http://www.youtube.com/v/I4S2Gu7ZDT0&amp;hl=en&amp;fs=1&amp;" type="application/x-shockwave-flash" width="425">
   <p>
      <object height="344" width="425"><param name="movie" value="http://www.youtube.com/v/I4S2Gu7ZDT0&amp;hl=en&amp;fs=1&amp;" /><param name="allowFullScreen" value="true" /><param name="allowscriptaccess" value="always" /><embed allowfullscreen="true" allowscriptaccess="always" height="344" src="http://www.youtube.com/v/I4S2Gu7ZDT0&amp;hl=en&amp;fs=1&amp;" type="application/x-shockwave-flash" width="425"></embed></object></p>
   </embed></p>

<p>
   <embed allowfullscreen="true" allowscriptaccess="always" height="344" src="http://www.youtube.com/v/I4S2Gu7ZDT0&amp;hl=en&amp;fs=1&amp;" type="application/x-shockwave-flash" width="425"> </embed></p>
<p>
   <embed allowfullscreen="true" allowscriptaccess="always" height="344" src="http://www.youtube.com/v/I4S2Gu7ZDT0&amp;hl=en&amp;fs=1&amp;" type="application/x-shockwave-flash" width="425">
   <p>
      <object height="344" width="425"><param name="movie" value="http://www.youtube.com/v/I4S2Gu7ZDT0&amp;hl=en&amp;fs=1&amp;" /><param name="allowFullScreen" value="true" /><param name="allowscriptaccess" value="always" /><embed allowfullscreen="true" allowscriptaccess="always" height="344" src="http://www.youtube.com/v/I4S2Gu7ZDT0&amp;hl=en&amp;fs=1&amp;" type="application/x-shockwave-flash" width="425"></embed></object></p>
   <embed allowfullscreen="true" allowscriptaccess="always" height="344" src="http://www.youtube.com/v/I4S2Gu7ZDT0&amp;hl=en&amp;fs=1&amp;" type="application/x-shockwave-flash" width="425">
   <p>
      &nbsp;</p>
   </embed></embed></p>