What bass do you have?
I have an M87 too, and I experienced the same with my passive bass, where I would play with the volume on the bass set quite low. I thought the pedal was borked.
But with an active bass the compressor always kicked in. But if I turned up the volume on the passive bass higher all worked as expected. Seems simple, but when you play with the same volume nearly all the time then it can catch you.
Ibanez: SR700 (-11), AEB10 (-03), RB850 (-87), MC924 (-85), RB960 (-85), AX50 (-85), RB850 (-84), MC800 (-78); Teisco EP-200B (-66). Mesa Carbine M9, Darkglass B7K, TKS W2126. A few pics