Plz someone answer me ) I wonder is that bug or not: what's wrong with shadows casted by trees, grass in an open locations (lightsource is sun)... shadows are moving not smoothly (as the sun moves), but twitching - they moves and stops, then after 10 second moves and stopes again. Is this game feature? thx for answer, and sorry for my english, its not my native language )

Up, so anyone have this problem?