Cover Group schows only down and stop

Configuration
1

Hi,
I just configurated my first group but it looks like that:
image
The down Arrow ist grayed out and you cant use, Stop and Up works fine.

Here is as I palced ad configuration.yaml:
cover:

  • platform: group
    name: Rolladen Erdgeschoss
    entities:
    • cover.rolladen_seite_eg
  • platform: group
    name: Rolladen Obergeschoss
    entities:
    • cover.bastelzimmer_rolladen_og
    • cover.buero_rolladen_og

Any Idea?

Thanks Michael