scrolling in tableview, is there a bug?

Hi, all

I am trying to make a tableview to show something off, every think works fine, but scrolling.

If I try to scroll the table view with a almost horizontal move, the move will change the position of objects in tableview as it should be. however if I release at over the limit of the table, the view will be stuck and never go back to normal unless I move it a bit. Can anyone explain it?

Thanks