I mining then I quit the game but when went back on I was not UNDERGROUND anymore! I was on land!

Put the summary of the bug you're having here
I was underground then I went to the menu but when I got on again I was on LAND!!!
*What I expected to happen
Describe what you thought should happen here
Is that I will be at the spot I was last at when I was playing
What actually happened was...:
Describe what happened here
I was not where I was last time but I was on top of where was!

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...FIX THE PROBLEM PLEASE
3. ...