Sims put objects in Box/Chest instead of container (fridge, bookshelf)

I was wondering where all my books disappeared to, turned out my sims put them into the storage chests instead of into bookcases. They also occasionally put grilled meals in there instead of in the fridge. 

One of my sims has the childish trait and owns the talking llama toy and he keeps putting it into the keepsake box instead of back into his inventory.