Jumpy links in CSS styled externally loaded text


I’m facing a really strange problem… I have made a movie that load text from an external text file and styles it using an external CSS sheet. Everything is running properly except that the links sometimes “jump” when I move my mouse over them.

Did anybody face this problem before? Here’s a link to the file, try and move you mouse over the “aliquet” link (red underlines text) towards the middle of the text: http://testserver.orangecreative.net/kirupa/

Many thanks in advance!