Span tags remove from kendo html editor

Hello.
I am using Kendo HTML editor.
In that, my original text was like,

<div style="left:30px;position:absolute;width:600px;top:55px;margin-top:-23px;text-align:left;line-height: 23px;" id="draggable133030-1"><fseparator><id_133030_1><span>Some text here</span></id_133030_1></fseparator></div>

When I paste something to replace text "Some text here", my html looks like,

<div style="left:30px;position:absolute;width:600px;top:55px;margin-top:-23px;text-align:left;line-height: 23px;" id="draggable133030-1">WorksheetId</div>

Here, if you observe, few html tags removed. I don't want those to be removed. How can I control this ?