Beatstep pro - Drum track play both 1 and 10ch

[RyoEnomoto]

Hi,
I use DrivenByMoss and it's useful.
Recently I bought Beatstep pro and try to use it with Bitwig 2.3.5.
And I found out Drum track on Beatstep pro plays both MIDI 1 and 10ch together when setting Drum track MIDI channel as 10ch. On Seq1 and 2, it doesn't happen.
The problem is when I use Beatstep Pro drum track with DrumMachine on Bitwig, it seems only 10ch works. So I need to set it as 10ch. Then as same MIDI data as 10ch is played with 1ch and the track with All-Ins (All MIDI channel) played as same note as 10ch.
Does anyone know how to avoid it? BTW, with same routing and Cubase Pro 9.5, this doesn't happen.
Thanks in advance.

KAZ