The upper control arm is always shorter than the lower arm. The upper has a tighter radius of travel. If the upper control arm is level, or if the upper ball joint is lower than the upper arm pivot at ride height, the camber will go negative. As the front rises the suspension drops causing negative camber. If the upper ball joint is above the control arm pivot the sweep will gain camber, then lose it as it pivots down. If the sweep travel of th earm starts at the same distance above level as it falls at full jounce the camber will remain similar at drop and ride height. It's all a function of control arm length difference and the stationary angle of the arm. This in itself doesn't necessarily cause bump steer. That all depends if the lower control arm and the tie rod assembly move in the same arc.
Doug