Problem with Scrollview

I'm making a scrollview based on built-in Scrollrect where items run on an arc instead of line. The way i made it: Create a vertical scrollview and add a script to calculate items' X coordinate relative to Y coordinate using circle equation: x^2 + y^2 = r^2. It was a success. But i'm having a problem now that if i scroll to fast, i can see items translate up (only affect their Y coordinate) too obvious before being relocated by my script (Calculate new X coordinate).