I have no idea why you are posting this as a bug.
Zambri wrote:Can this be related with some seo specifications of suffusion?
Absolutely not. I don't use any SEO plugins and I rank very high on all my sites (the Aquoid blog has a PR 6 and the Suffusion page has a PR 8).
Zambri wrote: Is there any way of improving seo with suffusion?
SEO in the theme is fine, if you are using it in the right manner. You are always welcome to try an SEO plugin if you feel that gives you more control. As long as you have good content with the right type of backlinking and the correct keywords associated with your site you will be fine.