if I am right these arrows reflects as a reaction to the actual load
basically that is the reason why are towards to your model I hope to make more sence now...
Ioannis, I defined the direction of the arrow myself, it gives me the option to reverse the direction of the restrain. The arrow shows the direction I'm defining every time. Since the part is "alone", SW doesn't "see" any loads due to reaction from another body. Pretty confusing. Anyway, efharisto :)