Riverbravo

Hello, I am new to Forge but have been playing MC for awhile. Long story short I have been playing on this one map for months. It started with a city then I got Forge and Archimedies and decided to set up some colonies. It all worked great at first i set up a town 20,000 blocks away. Then yesterday I restarted my CPU. I loaded up MC Forge and I found my self at my original spawn when I first created my world. If I delete the save and load from a back up in traditonal MC everything is better but if I load in forge I start back at the very begining. My MC version is 1.7.8 Forge is 1.7.2. I am not sure how to stop this from happening everything was fine until i restarted my CPU. Any and all help is appreciated.