Good afternoon to everyone, I'm new, I'm happy to be here, I'm Italian, I have a problem when I'm flying the drone is hanging slightly to the left, to say that there was wind, is it normal for you? Another question, I left 50/100 meters I made a mistake on the app, what could have happened? thank you so much

Perfectly normal. In P-GPS mode, the drone will pitch towards the wind to maintain position. In ATTI mode the drone will try to keep level but will drift with the wind.  

Agree with Betamace. Could you be more specifically of the mistake on the APP? I'd like to check.

Thank you very much for being very kind, I have modified the limit and now it is ok, now I have another problem, I hope it is not a factory defect, basically when I see the videos recorded by any known device of the dark bands running from what might depend? Here the video

New here too.  Glad to meet you.  Drone is rolling left or camera is tilted?  May have to up your ceiling and distance settings.