Enter in world at spawn point and lost everything

A couple of days that happens: i enter in my world and I found my self at the first generation point of world with nothing just as if i died, even though I couldn't have died because I previously left my character in safe place and even though i previously slept in a bed that wasn't obstructed (so if i died i should have spawned there)

Strangely, when I enter the copy (which i always do before exit the game) it spawns fine and where i left the character. I enter the original, it spawns like written above.

 More strange is: it happens when i enter the following day. If I enter 1-2 hours later, it spawns fine in the original world.