Armor Stands Dissappear

Armor stands and their contents on display keep disappearing from my home. Also rowboats keep disappearing as well. I can save and quit the game right next to one and the next time I log in there is just an empty space. I tried hitting the area to see if it was invisible but it drops nothing. So far I've had three armor stands disappear and three rowboats in the course of a week. Including their contents that ranged from enchanted diamond armor to enchanted bows and axes. This is a normal Minecraft game in survival mode started on a random seed, with no add ons or mods, and no other players have joined my game.