IE adds unwanted <p> tags

Hi

Using latest IE, Mozilla and FCK

This also happens in the demo.

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I add the word
test and then select <hr>

I view source code I get

<p>test<hr />
test</p>

I go back to editor and it looks fine

I go back to source code and it wraps <p> tags

<p>test</p>
<hr />
<p>test</p>
<p>&nbsp;</p>

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Mozilla does not do this so that if my client edits in IE he will get a different look for the site then if he edits with Mozilla.

Is there a solution for this?

Thanks

Chris