Iron golem gets inside

Hello.I have an Iron golem I created him around my house.EVERY time I close my world even for just few seconds and I open it again I find the Iron golem inside my house.My house is fully closed there is no way for him to enter.I tried to leash him to a fence but the same problem and I don't find the lead.

I hope you fix it,It's so annoying me.

My device is Samsung galaxy grand prime SM-G350H