Was in act 4 where I dropped my charms (3 martial art crack in the heavens gheed and 15 all red gc) to make room to craft after about 30 mins all of them dissapeared except my gheeds and crack I. Heavens
This is not a bug. All items disappeared at a set time limit. It varies with white, magic, rare, etc.
Ginger gaming mentor on YT has a video with time when they disappear.