Overbridge, Volume MAIN vs SINGLE OUTs


I just tried to set up Syntakt with Overbridge for the first time. Could someone have a quick peak at the attached screenshot, please? The single-outs sum is 10 db less than the main stereo mix coming from the Syntakt? That can’t be correct?

Warm regards.

When I solo the main out track, I am at -15 db to -12db which seems perfect, actually. When muting the main out and soloing the individual tracks I am at -25db.