I have a BDS. So for a joke i put the worlds folder into a new folder named "VERY IMPORTANT DO NOT DELETE" When i started the server later a completely new world with a different seed was created. I understood the problem in this. The code could not find the worlds file so it created another. So i deleted the new worlds file and removed the old one with all the progress into the main server folder, SO when i try it out its the same seed but all the progress is deleted. I checked my recycling bin and the only thing that was there was the new worlds file (the one with the different seed) which i even tested to see if that was the new one. So basically relocation of the folder practically deleted it.