Not that much counterjungling

After a game as a jungler, I decided to check my stats on the match history on League's website. Upon looking at the amount of jungle creeps that the other jungler and I killed, I saw that both he and I had the amount of jungle creeps on each of our respective sides killed being shown as being in the enemy's jungle. Not exactly a big thing, but still... For example, if I killed 120 jungle creeps, 100 on my side, and 20 on the other side, it would show, in the match history, as 20 killed on my side, and 100 on the enemy's side. Either it is a bug, or I have been in games where both the enemy and I flawlessly counterjungle each other without anyone knowing, even ourselves. As I said, not gamebreaking, but just an interesting quirk.