Why does Vintage B3 channel strip volume become low after switching patches in MainStage?

I was wondering if anyone might know what’s going on with this. When I create a channel strip and bring in the vintage B3 and adjust my volume parameters it works great. If I leave that patch and go to another patch and then come back to it. The volume is very low. If I open up the vintage B3 and just forward to any other organ setting it’s fine. Soon as I leave that patch and come back to it it’s the same thing. What’s really odd is that? I stuck a piano in instead of the B3 and did not have a problem. I am old and not very computer literate so diagnosing for me is challenging lol. I know it’s hard to diagnose something like this but I just thought maybe somebody might have an idea on it. Thank you so much and have a great day.

[Re-Titled by Moderator]