Yes ..... that pilot boat has got a mind of its own.
At one instance, the boat came alongside the PoR quite normally, but after it left it took off from the sea surface like an aircraft, skimmed along the shipside and finally fell stern ward back into the water.
When I repeated the mission another time, the boat behaved perfectly normally and came alongside and left like a "real" pilot boat.
I may be wrong, but it seems its behaviour is dependent on the correct position of the PoR when it comes to pick up the pilot.