This problem still occurs in alpha testing, I especially went fighting today to confirm it. I fight at a multistage level dungeon (Hooded Ones), items are supposed to bind upon pick up. Items I get from stage 1-4 are shown as bound to me. HOWEVER, items I got from the last stage (the boss) are not bound, I observed this 3 times and I am sure. I got 2 items, they have no sign Bound to: and they went directly to my bagpack.