Groupscheduler - lines shifting?

[Henning]

Hi all,

When I create a new group in groupscheduler, it shows OK.
If I close groupsheduler and restart, select the same group, it shows wrong
names to some lines.
It seems like some users (marked with questionmark?) makes the lines shift,
so the appointments appear to the right of the wrong names?

Any suggestions

TIA
Henning