Windows 7 x64
When loading a singleplayer world, it is counted as a multiplayer game.
Steps to reproduce:
1. Write down the number after "Multiplayer joins" and "saves loaded".
2. Open a singleplayer world.
3. Check the statistics and see that the "saved loaded" hasn't increased, but "Multiplayer joins" did.
I think it's due to that the singleplayer and the multiplayer has been merged together.
MC-9271 Opening a singleplayer world is counted as a multiplayer join in the statistics