the slime block pushes mobs incorrectly

When a piston pushed a slime block,the mob(like players) on the slime block will be pushed away,and the mob will fall down at a wrong place such as the front of the slime block or behind it instead of the original place.For example:if I was pushed by a piston with slime block at 0,0,0,when I fall down to the ground again,I will be at 1,0,0 or 0,0,1 or some wrong coodinate like this…