Basically yes that's true, actually sometimes it seems to take some event happening to the other (crosstalkedt) figure to trigger an update, just clicking anywhere on the figure is enough to do it, so will changing the camera angle or the lights.

The actual dial in the crosstalked figure won't change, but the channel will behave as if it has.

As to why this bug happens, the actual mechanism, I don't know, I only know that it does.