world reseting randomly

[HayareServ]

once i was making a map and i went back in and i was in the middle of nowere i had the co-ordinates so i went to them and it wasnt there like the world had been reset. and this happend a second with my parkour corse i was making anyoone have any answers for why this might be happening because i really cant be bothered to play minehut it wmy worlds are gonna keep reseting

[chillins]

I recommend before leaving your server that you do /save-all to save the progress. I'm not really sure how this is happening if you're able to provide any extra information I can try find out.