I found the solution. It´s all about inheritance. **inheritance**. Due to the recent changes in the prebuild versions, for me, the charts are messed up. In the sub groups or even direct at the servers I found a mixture of root charts (based on root\Displayed **root\\Displayed Reports Items) Items**) and local group oder server assigned chart. After cleaning up this mess, it looks fine and in order for the moment.
Regards Marco