No note response in Listen Editor

Hello folks,

when I open the listen editor in Cubase 8.0.5 and I play chords everything seems allright.

But when there are already chords in the editor and I want to overwrite them while playing new chords with my keyboard, there is just one note (or often nothing) audible.

The “acoustic feedback” function is ON.

Is this a bug in Cubase 8, as I do not havbe this problem with Cubase 7.5.