Logitech G502 clicking noise

Hi there,

Just like these videos:

https://www.youtube.com/watch?v=VpQ5_QDUMhE

https://www.youtube.com/watch?v=_Sn-niItP0M

https://youtu.be/DljQV3pE1lc?t=21s

Yesterday I just purchased the G502 after reading all the reviews and I was not disappointed. However, there is one thing that does bug me, but I'm not sure if it's just my mouse or it's just generally like this.

Since I play on a very low DPI 300. I tend to move my mouse side to side a lot and do large swipes. I am hearing a clicking noise, even when I move the mouse a little, left to right 3cms back and fourth constantly. When I release the mouse lock and go to free-wheel mode it is more noticable and louder. I can slightly feel something when I do this, it seems like the mousewheel?

Is this normal or should I return my mouse(which is a pain in the butt -.-)??

Thanks