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

Are you using mods/cc in your game ?

I have my sim order a pizza. The Pizza sim arrives and delivers the pizza, not problem...my sim sets the pizza on the counter. Then instead of taking a slice, I had my sim "put away" said pizza...but she walks right by the fridge, goes upstairs into the library and puts the pizza in the bookcase...when i open the bookcase inventory there is no Pizza, nor is it in the fridge's inventory. So, this cheese pizza has somehow fallen into the void. No idea how it happened, it's never happened before. Doesn't seem to break the game or cause any other issues. Just a missing Pizza. but just thought I would report it.

UPDATE: so the next sim day my sim autonomously goes to get the Pizza that is in the bookcase, However, the pizza isn't actually in the bookcase, it is in the keepsake box that is op top of the Bookcase. And they are unable to remove it autonomously, so i get error messages. Still don't know why or how my sim was able to put a pizza in the keepsake box instead of the fridge. 

My food has gone missing recently. I cook for a sims family of 7, so you could understand how annoying this is when I am trying to stack food in the fridge. Whenever I command my sims to “put away food” they will autonomously put food in keepsake boxes. Causing me to lose the food because it spoils and this is recent they used to put dirty dishes in these boxes but now they are putting just made food. I guess I could move the box maybe further away but my maid does this autonomously. I get the keepsake boxes are for all storable items but I don’t think they should be able to put food in there. Part of the new annoying part is not being able to drag these spoiled plates to the trash. Found like 6 dishes in the keepstake box spoiled had to manually trash them.