Strange mapping WordPress MultiSite

Hi team, I have installed a wordpress MultiSite for One of the sites is, which maps to

Something strange happens. The urls and (so without the www.) do not map to the same webpage. You can see it in the menu. is the most actual page. seems to point to some stale version. Every update I perform on the homepage is NOT shown on Even if I which the homepage it is not displayed. Whatever I do, I cleaned all the caches and restarted the VPS.

If you use it does go to the correct version. Also all other pages, like show the correct information.

Have you any idea what is going on here? The problem did not appear before we used MultiSite. Any answer, or direction for further troubleshooting is most welcome, as this problem is buggering me now for 3 fulltime days.

Thanks for your help! Sophie