Weird thing when soloing an instrument track

Hi there

Sometimes when I solo a midi track routed to an instrument track, it soloes the midi I want as well as the original instrument track.
What I dont understand is it’s not regular, sometimes it happens , sometimes not.
Video demonstrating the issue :

https://www.dropbox.com/s/w6qjs80sygso2zz/Issues-Solo-instrument-track.mp4


Is there a hidden function somewhere? Cause I didnt find it.

Thanks !

strange… did you try trashing your preferences?