Well, I just finished the planet Nar Shadaa and went to Onderon. When I got there, I wanted to put some items on but EVERYTHING was gone on every character except what they had on. Before I left Nar Shadaa I sold alot of stuff but I still left alot there. I even checked it before I left and I still had everything...

 

 

 

So... where did all my items go???

Check your inventory list...make sure you are not just looking at "New" items. Since you just viewed them not long ago, nothing would be showing. Look at the "All" items area.