For example, if i am in page 2 and scoll up the grid is emptied then page 1 is populated and then page 2 is populated (which was the visible one). As a result, visually the scrolling is ugly, since we see for a fraction of time the begining of page 1 and then we see the top of the page 2 and a portion of page 1. This is not really a bug but visually the users do not like it. Why is this happening?