Item and villagers disappearing

Excuse me, i had some issues when i was in survival mode, i wanna moved my items from one chest, so i broke it. I put some item it can fit in my inventory, but when i back after 2 minutes more or less, it was disappeared it was the first issues, the seconds, is the villagers and more passive mobs, despawn after i dont go to that locations for a few minutes... Pls fix it faster.... Idk whats wrong...