You said you have connected them to be a squad. In the edior you can put them as you want, but a preview mode the formation of the squad will be 'wedge' as default.
If they won't be a squad, and every soldier will be on his own, they'll be right where you place them.
I think you can do what I said as doing every soldier on his own (if it's an intro it's ok I guess), but if it's not an intro, then connect them to a group after the line thing, using the join waypoint or something, I dunno.
Maybe someone else will help you more than me, but I can tell you it's because you connected them into a squad, which as form 'wedge' as defualt.