@rikzombie, this kind of desyc happens when <game folder>//data is not cleaned after you have created the map. What both players should check before starting a map is go in <game folder>/data and delete the following files and folders (if exist):
-
index.bin-
RMGTemp You can check
this guide. All known issues and preventions are described there.
Thank you @Uraabk! I am gearing up for release!