Object moving by mouse error. Jumping at 0,0,0 randomly.

Hello everyone.
I tried to make example for dragging object by mouse, as shown here:

on this graph “engage sphere movement with mouse cursor”:

It seems that somehow error occurs. I tried to make same logic with Get Hit Result Under Cursor by Channel on sphere in YZ axis, X is always 0, making something like angry birds style sphere launch. But at some point randomly Set Actor Location receives 0,0,0 and jumps at this point. I found that maybe it was because I moved mouse too fast, and cursor slipped away from the sphere, but even if you move very very slowly and cursor is always at center of the sphere, it also happens.
Why is this happen?

Thanks in advance to everyone.