contao on subdomain problem mysql?

Hello out there,

i tried to install contao on my subdomain. paolo.eiscafe-lombardo.de. Therefore I created a folder named paolo on my webspace. The problem ist that the content is not displayed correctly. When I go to eiscafe-lombardo.de/paolo everything is all right. It may be that there is aproblem with the Mysql database? Does anybody know whats wrong and how I can fix the problem? I'd like to have two different websites a private one and a commercial one.

Greetz

Paolo