If the marshaller slides, in FSX it would mean you had the "Advanced animations" flag turned off, but that doesn't exists in P3D, so it can't be. Another possible reason, is that you are looking from too far away, or with a too wide zoom setting, so animations are automatically turned off by the sim.
If it's not that, I can't see any other possible reason that some setting/tweak gone wrong in your settings, because the problem doesn't happen here, and nobody ever reported it.