Here is a couple of screens.
This occurs when adding units via "Spawn in zone", "Spawn" and manually placing units via Zeus
I'm hosting this on my dedicated serverbox
https://imgur.com/a/uUCMd
Each line shows where an units have been traveling
This happends on my self made mission file, it's basically a template file where I've added respawn location and some units to pick as player.
On some mission file this do not occur so I believe it's some kind of option or feature I've turned on but I can't figure out what it is