@Caden Joy, yes, I did go back. I constantly do and this was never a problem, because I hate the PVP after 1.9 so when I join a server I always go to 1.8.9, and on singleplayer I mostly play on 1.9+ (1.12.2, 1.14 and so on...)
but I changed it one time to 1.7.3 BETA because this was the first version I played minecraft on and I wanted to try it again. Maybe I mistakenly joined the old world, but I doubt it. I started a new world from what I remember.
But let's say I did mistakenly join my world which got reset. Is there a way to recover all my buildings?
And if I did not join it, then why would it get reset?
Thanks for your replay!
violine1101, ok, but considering I did not join my world on an older version. Is there a way to recover it? I dont think the files would get deleted...