Yeah the problem occurred because of no background.
Firstly when I was making that animation I didn't think that i'm gonna make it this much long.
it was actually to test the sprites in Pivot (yeah, it was my first time using sprites in Pivot)
I was testing stance sprites of Kakashi, but then who knew I would actually continue it and make a video of it :-P
After finishing the video, I thought 'why didn;t I put a bg'
but i guess it was too late to think of that and I didnt wanted to change it anymore
OK, and like i told u, flash is better, you can make all the sprites stable, one shared axis, you can use onion skin too, that's the best!