The first thing to check is are there any volumes CCs on the track? Look for CC7, CC11 and/or CC2 as all three will affect volume.

If there isn't any volume CCs then look at the MIDI sound source. For instants I run into that problem sometimes when using Kontakt as my sound source. Sometimes the Kontakt volume is low to start so I move it up, then it resets itself to low again on restarts. Then I will add a CC7 to that MIDI track so it will start at the volume that I want.

I hope this helps and good luck.

Whenever I get something stuck in the back of my throat, I dislodge it by drinking a beer.
It's called the Heineken Maneuver.

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware