Items disappearing from inventory

I keep having things disapear all the time. especially homework. my latest was a whole hose hold off furniture, I was playing one sim and decided to move the house hold to a new home while I was playing the dad away from home. I took him to a junk yard in another pat of town. decided to move them all to this house, so I got him to select move home and when it loaded I selected keep furniture, when they all arrived it was all gone. there furniture and the furniture in the house, all gone, and the game didnt give me the money for it either. so i cheated and did kaching a lot. but it takes away all the plumbing that had been upgraded and all the things they found that we kept. including the hard to find plants.