Problems with Yahoo cached web pages

Google cache is fine

[danielanaidu]

The Yahoo cached pages for every page on my site have a bad top border. Part of the html that corresponds to the font is being displayed inside the top border.

Specifically, this is being displayed:

U</font></a></font></span></b></span><b><span style="font-size:20pt;font-family:Georgia;color:#333399; text-shadow:auto"><a href="index.htm" style="text-decoration: none; "><font color="#333399">SA

instead of just displaying the word USA.

However, the Google cache files are fine. Any ideas what could have caused this? Could this have any negative effects on page rank? Thanks for any ideas/suggestions.