Gangplank's cs counter

it seems like when you get to 200+ cs with gangplank the cs counter glitches and the number will go up and down. I had about 285 cs and a minute later my cs counter said i was at 225 when a minute earlier it was at 285. it seems to jump to what you have and then jump really low and then jump back up and goes back and forth all game. The group of friends i normally play with have all noticed this weather its me or my friends playing gangplank.

Edit: I just played a game of Gp and at 20 min i had 168 cs but the post game stats only showed me with 141 cs