content doubles in edit form

Hi,

I have the following issue: Sometimes when I edit a node, the content of a certain text area is duplicated. Sometimes it's a duplicate of another language body content and sometimes it's the content of the same language. I don't know this issue is related to ipetranslation, fckeditor or the sync-function. It mostly happens after I edit a text area, save it, and then go back to the edit form.

In the example I give you here it was the Dutch content that doubled. Sometimes it doubles in the text areas, but you don't see it because you're editing another field.
http://dannyjoris.be/files/fora/iptranslate2.swf