So I started the game and joined my world, and found out I already had the game running... so SELFIE!
Messes up you inventory as the second login got the original inventory it seems or something, not sure just weird.
So you connected via multiplayer (connect to localhost)? It's an interesting situation Technically, you just connected to your own "server". Only thing that messes your inventory is the fact, that you're still the same user. We should implement a restriction, that a client cannot connect multiple times to the same server (in this case it's funny, but on big multiplayer servers that could be a serious issue)