Match History not recording all of my games

Just today, I was surprised to notice that at least two games that I'd played today in ARAM were neither recorded on my match history in the client nor on the LOL homepage. For one of them I was playing Ryze, and another I was playing Poppy. There may well be others that I didn't notice, but those are the ones I did. This is disturbing to me as I do like to review information from past games to see how I can improve in future ones, and would like to know that my match history is accurate. Thank you.