skylark - the only thing I can think of is that the burrs are misaligned, or you swapped them around, but I can’t see how that should make any difference.
If I were you, I’d repeat the process: take it all out again, clean all the surfaces very well, and re-install the again.
Remember, when tightening the screws, don’t do each individually fully and then move to the next one. Instead, go over all of them gradually.
Good luck.