Just from your description I would say the swashplate has not been leveled yet so it is already sitting at an angle when the helicopter has been armed and is ready for flight. If the swashplate is at an angle before you even apply throttle, the disc (rotor blades when spinning) will naturally tilt in whatever direction your swash is leaning. Adjusting the swash links from the servos to the swash will help level things out.
Tis my guess.................. To verify set the heli on a smooth level surface, unplug the motor lead or leads and turn on TX, then plug in heli. Look at the swash from the front and from the side. If not perfectly level to begin with then you need to adjust.


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