I think that's a sign for the campaign being messed up. Maybe you've copied some files to the wrong place or something.
I would recommend making a backup of the original, unmodded Lugaru folder. Then, if you want to play a campaign, you make a copy of the original's backup and mod on the copy. That way, experimentation is less prone to break everything because you can always start from scratch without having to remember which file was where and why and whatnot. And you can just keep the modded version at hand, ending up with a lot of Lugaru folders, each having a different campaign inside. Yay.