ReaVerb Bizarre Fader Graphic Bugs/Glitches

[LearningReaper]

Mac Mini M1
16gb RAM
512gb SSD

macOS Big Sur 11.1

Reaper v6.21 for macOS 10.15+ Catalina/Big Sur

- Echo Generator: ErrDst
- Filter: Highpass
- Reverb Generator: Stereo Width
- Reverse: Dry
- Trim/Gain/Stretch: Pan

The above parameters in ReaVerb have properly functioning faders/sliders. All the other parameters do not. The values change, but the faders do not move.

The strange part: Once the faders of the parameters listed above are adjusted, all the other faders will jump to their position as soon as you try to adjust them.