Old player's inventory is loaded on LAN game

Sometimes when I enter the world from my pc (via LAN) I find myself somewhere else from where I left and with a really old inventory (like years old). I think the map reads wrong the player.dat file of my player.

When this happens I have to close the game and launch it again from launcher (I don't need to do anything on the other pc which is "hosting" the game).

Thanks for taking the time,

~Nick