Domain Mapping Issues

Hello together,
i had set up the domain mapping plugin on a multisite sub domain installation. the wordpress installation is installed on hostgator in /home/cpanel-username/public-html/wp-folder/wp-config.php and i had configured add on domain pointing to that folder. now i tried to map a domain (www.example.de)hosted at hosteurope.de pointing to a subdomain created in the multiside installation e.g. test.multisite.de . i changed the A-Record for the domain to the ip adress of hostgator. Everything works fine, when i ping the http://www.example.de the ip adress is changed to the hostgator ip. but when i try to go to the page http://www.example.de the mapped subdomain isn´t showing. its showing a different site. perhaps someone can help me...