Sprites looks broken when I move them with fingers

Hi~

I used to only test my game in android and it performs well, but there is a problem when I start testing it on iphone4.

That is, Sprites looks broken when I move them with touch events.

In my game, I have 5~6 sprites with different z-order in a layer, and they will be moved to different locations by user’s touch events.

However, when I play it in iphone4, some sprites with higher z-order will be “partially” covered by sprites with lower z-order, so it looks broken….

ps: fps shows from 50~60, so I don’t think that I put too many sprites on it and it performs perfectly in android…QQ

Does anyone know how to solve it? or what causes this problem?

Thanks

I think I know how to solve this problem. I will check what I did to solve this problem when I go home.

Thanks for your reply~