Morgana has a bug

So ive noticed that at the end of the game when i check out each players stats, sometimes it shows morgana only did, for example, 40 points of healing, which is obviously a lie since she has spell vamp as her passive. Other games, it shows she did 1000+ healing, even when my game was around the same time and i had the exact same build. Its not that she not getting healed, its that the graph that shows how much healing she did after the game is wrong.