Hi there - I’ve got the same problem. BFD 3.4.2, Reaper 6.34, Win 10.
Randomly, cymbals that are not in the same choke group will seemingly choke each other. I can’t be sure if it is always cymbals doing the choking or just other kit pieces. As another user said, I can’t be sure if other kit pieces are also getting choked as I wouldn’t know if they’re shorter sounds.
Re-opening the project seems to fix it - for a while.
Hoping to see a fix for this from the developers, please…