Kicking Guild Members not working anymore

[Aviarium]

I just tried to kick inactive members. That is no longer working, while i'm sure that i kicked inactives weeks ago, now nothing happens anymore. When i klick the Kick Button, i get the question popup, if i really want to kick that member. when pressing yes, that popup closes and the information "player xy successfully kicked" appears - but the player does not vanish from the members list.