[Plugin: SEO Ultimate] How Remove canical URL from external page?

I have my wordpress in a directory and my forum in another. Neither are on my domains root directory because of SEO conflicts.

Everything is running smooth. I do use an index.php on my domain root so that when people enter my site, they see wordpress as main page.

My problem is, that SEO Ultimate plugin is making my index.php use domain.com/wordpress for canical instead of domain.com

Is there any trick to remove or change that for my index.php?

Any feedback is appreciated

https://www.ads-software.com/extend/plugins/seo-ultimate/