Help with editor?

[Figaro94]

Hello!

This is my first thread here. I'm very new with the HPL editor so I'm not sure what I'm doing wrong. But i started to work on my map a while back on my stationary computer. I later moved the map to my laptop so i could work on it in school (The map I'm making is a school project). When I'm home I prefer to use my stationary but when i transfer my map to this computer everything I've done on my laptop is gone! The map looks exactly as it it did when i first moved it to my laptop. I've tried every possible thing that I can imagine to fix this problem. Please tell me what to do.