Easier to show it with a screenshot, and I apologize that the screenshot is in spanish:
To reproduce the bug:
1) Go to your stats page.
2) Select "Jungler" or whatever role.
3) Click somewhere on the graph to select a spot in the timeline.
4) Two players will appear on the right, but rarely are they actually YOU.
Occasionally it does show me there, but more than half the time it shows some other random players from the game, and not me.
I know it's a minor bug but, I use the stats page a lot so I keep seeing it.