Minion Kill Counter Bug

Okay so pretty much I was having a good o'l game of league and I was looking at how much farm every had as you do, when I realised that the minion kill counters of people was changing. And I know what you cheeky lads are going to say,

"The kill count is probably changing because they are killing more minions ya knob!"

But what I mean is that the farm count was fluctuation to be more, then less and then more again. Like I had a peek at my farm and it was at a juicy figure of 90, then to my dismay it suddenly turned to 80!

I have two screen shots of the poor Elise on the enemy team who apparently finished the game with 38 farm but then had 81 according to the post game lobby.

This issue was happening to the other team as well, the Elise mocked me for only having 5 farm as it appeared to her....its okay though she is actually a wonderful lady :,)

Would be great to hear what good guys Riot have to say about this. ^_^

....I'm to technologically impaired to add the pictures