I was playing Alistar in an ARAM game, and I noticed my score was a bit off. I had 1 more kill participation than there were kill on my team. My team had 13 kills and I had 1 kill and 13 assists. At a separate point, my team had 26 kills and I had 4 kills and 23 assists. Help? Imgur album here
It is part of the massive Syndra bug that has been happening since the newest patch hit live.
Not only do kills Syndra gets not register, but sometimes it even registers that an allied teammate kills an allied teammate and gives assists accordingly.
This is likely what happened here since there is a Syndra on the enemy team in this game.
Example of team killing counted on score.
