Stab mod after loop(acro) holding an angle

[antonh1611]

Hi,
to train acro flying, i have setup ACRO mode on my momentary switch, so in case anything wrong, i just release it and is in STAB again. But after i make a loop, releasing the switch, the quadcopter stabilize itself but in a certain angle (cca 20 deg) to front left or front right. I must enable acro again and release it to reset the angle to 0, or drive like that and make a few hard moves, then it stabilize it self again.

Is anyone experiencing this?