Quad problem

Hey i have some problem with apm2.6. When i take off in auto mode the quad go in air for about 50cm anf the suddenly roll in one direction does anyone know what can be wrong? I have

3dr apm 2.6
X600 frame
1400kv emax motors
Q brain esc 4 in 1 4x25amp

[infocopter][/infocopter]