Odd that they buried the dead under the floors.
Stockpiling? Hhmmmm....Perhaps they were under seige.
Burying dead folks in the house isn’t as odd as you’d think; Catholics bury saints under chapels. I could see someone who believed that their ancestors stayed around to help them would see it as only logical to put them under the house, where they would be out of the way, yet still close enough to keep an eye on things.
Civilizations in South America mummified their dead kings, and then carried them at the head of their armies to provide leadership in battle. It’s not burying under a house, but the principle’s the same. The physical presence of the dead confer protection for their loved ones.
They did the same thing in ancient Sumer A curious practice