Changes in my world

Hello, good afternoon, I play minecraft on my cell phone and my problem begins when after finishing a basic mob farm, I close and save my world under my farm, and the next day that I connect to my world, I appear at the spawnpoint (place where do you appear when starting a world) not far from there and my inventory is empty and I have 33 levels of exp ?? And I don't know what happened, since if I had died I wouldn't have 33 levels of exp.

I hope you can help me solve my problem.