You can tell I started with the PitchFactor (I’m still calling it “Pitch Mix”).

All I can think of offhand is what happens with a Delay algorithm, and Delay Mix.  With stereo in, if you tilt the Delay Mix away from center (say, 0 or 100), both outputs will only have that side’s effect, A or B.

That may or may not be the case here.  If it helps, I always use TremoloPan for a stereo diagnostic test.

Maximum Depth, Square Shape; slower Speed, Width 100.  If you don’t hear equal levels alternating each side, something’s screwy upstream.  You can also use that as a downstream test.