Is anyone else having issue with the difference in volume with L&R outputs?

With mine, the RIGHT output is always louder than the LEFT.
Any instrument going into L/MONO Input of the BAM, when it’s bypassed (ACTIVE button off), the LEFT & RIGHT Output are the same volume.
But when I press ACTIVE and turn the effect on, even with the mix knob at 100% DRY, the RIGHT channel is up to 3db louder than the left. Also at 100% wet, the RIGHT output is louder.

This is quite a big problem because I want to get a good, balanced stereo reverb.
Just wondering if this is only an issue with my BAM or if others are having the same problem..

Cheers.