Is my Minecraft glitched?

So heres the story , I accidently caught a sheep in my house and though , I guess I will keep the sheep. So I did . The next day a bunch of pigs , sheeps , and chickens came into my house and there are no openings inside my home. My cousin told me it was because for the 1st day they will call others with them wherever the caller is (which was the sheep.) Then the next day some animals had disapeared from my house . The next day after that even more have disapeared and now I just had some chickens and sheep. I found a chicken that day and decided to keep that , knowing that the chickens don't call the others and just lay eggs (Just a guess) So I kept that one and the next morning there were more animals . So I assumed it was the same with the chicken and the sheep. I decided after that I would no longer have any animals in my house. I shoved them all out of my house and fell asleep at night. Then when I woke there were a bunch of animals again even though I shoved all the animals were pushed out! Why are they coming back!?