Singleplayer save acting strange

So lately ive been playing my single player survival world, and I save everytime I get off. The problem is the next time I get on, I am not in the same place (location) as when I last saved and I'm missing items from inventory only. It almost seems like when I log back on it loads up a previous save not my most recent. Twice ive loaded back with all my items that I was missing before but I was still in a totally random spot on the world. I'm always in the general area of my house but always a different part then where I saved. and I'm certain I didn't save in that location.