I just ran into not being able to put away items in the fridge with just one family and discovered it was because two of their grocery deliveries that I thought hadn't happened actually did, but the delivery bags had been left on the sidewalk on the left side of their house toward the back of it.
It's a hectic household with 5 Sims (two of them toddlers), so I just somehow missed these bags till I was just so frustrated that nothing I did would make them able to put away leftovers, etc. Once these two delivery bags had been picked up and unloaded, everything went back to normal.
I'm glad I was able to get the bags okay, because I initially panicked seeing them completely off the lot. They've had several deliveries, so I'm really not sure what happened that caused these two to bug out like they did.
So anyone with the fridge storage issue specifically, I'd advise to do a complete sweep of the lot and surrounding area for lost grocery deliveries.
