Wait, I think I remember now.
In my first mission ever in OFP, I did the same syncing thing with tanks. I just gave them two waypoints, and synced the first one. Thanks for reminding me bro! If that doesn't work, I'll try the "careless" attribute.
** EDIT **
Unfortunately your solution didn't work - but mine worked lol. You just gotta make the unit's first waypoint "Move" and sync that. I also found out it's the case for West units as well. Probably the same for Resistance and Civilian.
Chris