Problem/Bug My server changes it's world when I switch the online mode between true/false.

Hello. I started my Minecraft server and just built beautiful spawn for it. But I just forget that my friend doesn't have the game purchased, so he is using a cracked version of it. I told him that I will just change the online mode to false and I did it. I changed the .bat file (-o false), as well the server.properties (online=mode=false). I made everything false, but when I start my server the (onlide=mode=false) becomes again (online=mode=true) and I didn't really tested it if my friend can join already, because I was really upset that the world with the beautiful spawn disappeared. I was in brand new world. I got upset, decided to change ''-o false'' to ''-o true'' and said ''All this hard work for nothing''. Then for my surprise the spawn returned. And when I change everything again to false, it happens again. When I return it to true, the spawn returns. Also, the online=mode=false changes to true, like I said. How I can fix this, so the server can become cracked and the spawn will be still here? Also, excuse me for bad English, It's not my native language. :/

 

Oh man... in my country its rare to meet someone with purchased Minecraft. I guess the server will be English. Thanks anyway.