Do you mean you can't see the stuff you put down? Yeah, I've had that before. On the PvP server, I was at Xsyon Legends with a cart. I crashed and logged in with that 0/0/0 stuff bug, and was able to sprint freely with no encumbrance. However, when I put down the cart I was holding, it completely disappeared, but the other player I was trading with could see it. I completely lost that cart, he said he will hold it until I can see it again, and so far, no luck. Either way, you'll need to fill out a ticket to complain. I haven't, just letting you know that you aren't alone. I am not sure how to reproduce this bug, I just know that it happens rarely, and to not mess with the inventory while it's happening.

This can happen when a player disconnects due to a bad connection or interference from an anti-virus program. There's really nothing I can do about this situation at this point.