The chunks loaded wrong.

I had a house with my minecraft cat that I really loved. When I got back in the next day/ today, my house was wonky and half of the house was missing and loaded somewhere else. Also my cat was missing and it broke my heart so much I started crying. I'm not sure if you can do anything about it but please fix this bug, if it happens one more time i'm quitting minecraft for good. I've had that cat for a whole year and i'm heart broken.