CKEditor replicating the parent div

Hi,

If you have a text wrapped in <DIV> and if you enter a new line in the text, a new <DIV> is getting created with the new text.

Suppose we have a content <div> the text </div>
now, if you click enter after "text" and add additional text "is new"then a new <div> is created like -
<div> the text </div>
<div> is new </div>

Please let us know what can be done for this.