Losing items when logging into a world without internet.

I was working on a world all last night, and I had made a decent base, and had a set of diamond tools and an enchantment table. Well, I had all my goods stored in my inventory, and I logged off for the night. When logging in this morning, I didnt have wifi for a couple minutes, so I wasnt on my account when I logged, rather my name was the default "Steve". I didnt have my inventory of items. I assumed I'd log back in on my account (my wifi started working now), but after logging in on my account, I was at world spawn, and all my items and XP was gone. Now the world had still been mined out, and I still had my house, and items in my chests, but it was as if I logged into a new account because my inventory was completely empty. Also, despite what it says about 1.14.20 above, I couldnt find my actual version which is just 1.14.0