All helis do this, but with small one it seems worse because the tail push it side ways, when you get up 8 or 10 inches it will be easier to control, get the trainer gear if you think it will tip over,

Make sure that the swash plate is level 90 to main shaft, (UNPLUG MOTORS FIRST)do this with the idle up switch on and stick at center. assuming that you have not changed the blade pitch or servo arm positions, servo arms and linkages should be at 90 angles and blades close to zero pitch. Level swash plate 90 angle to main shaft at this position.

Also note if the Heli spins nose left or right and either correct with rudder stick until you hover it too set the proportional ,
correct the lean with opposite on aileron, viewing from behind, it might also go forward or backward correct, get used to moving the stick in circular motions,

Cheers Mark M,
www.pdqflyers.com

E-Flte Blade CP , Century Raven 30 w/Toki 40 & toki pipe , Century Raven 50 w/OS 50 Hyper & K&S of Japan