when I died for creeper gave / difficuty 0 and went back there and my items and mobs (chickens and cows) had been invisible and my house is made of gravel had turned doors

I was by mining there after I finished I left the cave and saw a creeper then he killed me after I was born and I / difficuty 0 to pick up my items and when I went there they had gone over I jumped into the hole and took the items so they were invisible and went to see my raising chickens and cows and was just a little kitty but the other animals were hidden because I heard the noise of chickens then I leave the world and went back there they appeared and then I went on the 4 floor of my house that is made of gravel and everything had turned doors