Stepper control angle run but not correct the angle!

For bow i can run the stepper, and correct for PP checking, and i try tu run stepper with angle control. Everything are good. But when i send the command T90 the motor turn but a litle bit, when i send command again T180 the motor not moving. Butwhen i send command T0 the motor go back to 0. And iam trying to send command T180 the motor only turn litle bit like T90. And this the picture of motor.monitor.