Hey so I kinda tried searching for this issue (perhaps not hard enough).
Each time I go to adjust the PVOL (pattern volume on internal mixer page), the PVOL will jump to max before finally coming back down to whatever the level is shown. Im using Overbridge on Windows while this is going on (havent tried anywhere else)
I dont know where the volume of my pattern is set by default because i cant see its true level, until after the jump.