Ok i just got the Tein S techs installed yesterday. And I think we forgot to pre load them. I think we tightened everything while it was still on the lift. I drove it home and all felt fine. Will this cause any problems? Can i still fix it???

Puts extra load on the bushings I believe, it's bad because it doesn't allow them to move as freely and it will wear them out a lot faster.

Just jack it up, losen them, then put it back on the ground and tighten them to specified range again.