If I leave lutefisk in the cube, quit, and come back to the game, I often find that it has disappeared. Bye bye lutefisk!
It's in another container type. There's a bug that moves stuff around in the various containers. You can even end up with other items than lutefisk in the lutefisk cube, at which point dragging stuff into the cube will make duplicates of that item, instead of more lutefisk.
Note that the disappearing lutefisk can wind up in a container-type that you don't yet actually own. For example, earlier this evening I restored a game and noticed I was missing all of my lutefisk. Later, I found an Alchemy container and it had all of my missing lutefisk in it.
Fascinating! I don't see it in any of my containers, so I guess I'll initiate a dungeon-wide game of Hide the Lutefisk...