Unfortunately sounds like something's up, though likely minor issue.
Yes stuff is well tested by Bjorn, especially compared to many other operations this is small done by him & he is very good, super hard working & really likes what he's doing. I have every confidence it did leave him ok. However it's a long way to ship things can happen, I get packages off the USPS truck in summer for example that they have box sitting in sun all day in non AC truck so when u open box the gear is actually hot to the touch, not good for electronics.
But more importantly any electronics can have issues even the most expensive studio outboard gear. After all the components inside are not usually made by the person making the product and those can fail. Must say issues with BJFe products are not common, and he takes care of all his products for life so it's a better situation than any u can find out there.
It really should be easy fix for yours since generally it's working but sounds like volume should be much more. Bjorn will take great care of you. Then you will be set as those are 2 of my fav BJFe pedals and lots of others as well.