I won't guess and I don't know, but I can tell you what happens. On most helis, the tail rotor should be perpendicular to the ground (or main rotor plane). As viewed from the rear, some helis tend to hover with the right side (starboard) tilted slightly down. Having the tail rotor tilted a couple degrees to the left can help to straighten it out. Other helis are tail heavy and having the tail rotor tilted a couple degrees to the right will lift the tail a tiny bit so you don't need as much forward trim to stop it from drifting backward.
If your heli is perfectly balanced (ideally they all would be), you normally want the rotor perpendicular so the heli won't drift forward or backward.