Old world lost

[TSM 0]

I recently came back to my old server to play again with some friends of mine, and when I tried logging in again after being afk for about 5months, it just kept sending me back to the minehut lobby. Every time I log into the minehut lobby, it tells me I am using an older version (1.15.2) and so, I switched to the new version and it finally allows me to join my own specific server but it is a completely new world. Any reason why my old world does not load? 

[ztimhirsch1 31]

Hey there! Could you do/worlds for me and check if you are in a different one?

[RG2N 0]

Dashboard --> Settings --> Enter level name --> Save --> Restart

[ztimhirsch1 31]

13 hours ago, RG2N said:

Dashboard --> Settings --> Enter level name --> Save --> Restart

This legit doesnt solve his problem at all