Forum:Items Disappearing

I'm not really certain what's going on with this, but this weekend I found a Staff of Regrowth in the Underground Jungle, made a Meteor Hamaxe, and got a full stack of Meteorite Bars. However, this morning, I went to fight Skeletron, and realized I didn't have my Staff, which I use as my primary weapon. So I go back to my base to get it, and it's not in any of my chests or my piggy bank. So I decided to go back to the Underground Jungle to get a new one, when I realise I don't have my Hamaxe. Since I need it for Crystal Hearts, I go back to get it, and it's gone too. So I go to my Bar chest to get more Meteorite, and all my Meteorite bars are gone too.

I haven't let anyone on my server in well over a week, and all these things disappeared this morning. Does anyone know what's going on?