I'm installing SLP longtube headers on my 2008 pontiac g8 gt. I lifted the front drivers side only with a floor jack and installed the drivers side header. When I let the car back down to the ground I noticed the whole front end is sitting really high. I can't see anything that would cause it to sit really high.
It might be that the suspension is just stuck and needs to be driven to let it get back down to normal ride height. It may also be your strut is inot working right, but drive it and see if it settlesdown.