Shaking / bouncing Net and Jerseys ?

I just noticed it for the first time that when playing the net bounces up and down a little and in the same steady motion the jerseys shake up and down in the same way, it's just a little bit but still looks kinda strange. Strange thing is when you play with one player a practice freestyle shoot then it doesn't do it, so it's only when playing a normal team vs team game. Anyone else got this problem or notice it and is there a solution to this or is it something that simply cant be fixed ?