post-posting editin spontaneously changes image hyperlinks

Reproduction steps.
Write a post using RTE. Select image tesk from flick-r, example

<img src=”http://static.flickr.com/70/227944888_a161fc383f_t.jpg&#8221; width=”100″ height=”77″ alt=”Sunday afternoon” />

place text in post using ‘html’ button in RTE toolbar.
This works. Example: http://wendyhome.com/2006/08/28/teachers-behavioural-code-ohio-1872/

Then
Edit post after publishing and a new line with a short hyperlinked underline spontaneously appears after the image. Example: http://wendyhome.com/2006/08/27/karaoke-cling/

Then
If you edit again and you have text under the image all the text becomes highlighted (I dont have any published examples of this becasue I end up re-writing the post again to avoid it.

I looked at the ‘code’ in the comment by pressing the html button in the post edit view and it looks like an ‘moves around’ inbetween edits.

Is there some specific thing I could do to stop this happening? Is this a bug (feels like it to me – because it makes me look at code and I’m a code-phobic 😉 )