If you edit the content with attributes of eZOE in IE9, a new line will increase automatically each time you want to edit.

Steps to reproduce:

1. Start by creating an article with the following HTML code in it:

<p>IE9edit</p>

And then publish your article.

2. (First edit) Edit the same article, and an empty line will be added in the end:

<p>IE9edit</p>
<p> </p>

Click on publish to save the current state of your article.

3. (Second edit) Edit the same article once again, and one more empty line will be added in the end:

<p>IE9edit</p>
<p> </p>
<p> </p>

Click on publish to save the current state of your article.

4. (Third edit) Edit the same article one more time, and one more empty line will be added in the end:

<p>IE9edit</p>
<p> </p>
<p> </p>
<p> </p>

Click on publish to save the current state of your article.

Each time you edit your article, a new empty line will be added at the end.
This only happens with Internet Explorer 9.
In Firefox this doesn't happens, and no extra empty line is added.