After switching onto another Xbox on the same account my minecraft world has saved some of it and not saved some of it.

After going on the new Xbox with the same account when going on my world only half of I has saved and half not so it's very confusing as most of my things have not saved or some have duplicated I have tried going back on the other Xbox to see if that's the same has happened and it has. Sadly, I didn't make a backup world so I'm not sure how to fix this problem.