I have a weird question about this as well. Anyone have there volume jump up on a preset out of no where? When i saw this post i thought about something that happened a few times. I have my levels set on the VU at 0. When i went to the gig it was wayy over 0 on my preset?!..was really weird. I had to reset the levels. this happened a few times and i thought it was just me im using a liquid foot JR+.
Do you have any pedals configured for volume control, or a level boost switch? Any differences in controller setup at home/practice vs. gigs? Have you checked the output mixer MAIN slider for possible changes (caused by volume increment CC) on these presets?
Have you ever backed up presets before a gig, then compared one from this group to the version you had to adjust at the gig?