There's a poultrygoose in my house that moves things when I drop them in particular spots. One spot where things get moved to (and pop away from) is the area of floor right before the door that leads to my backyard. This also happens in front of herb gardens in the backyard.
I hadn't minded it before, but now some things seem to have either popped off the screen, or are now under something and I can't find them.
As a side note, a "Search House" button (similar to the Search Inventory button) would be very useful.