That's how poly bushings work. The pins aren't retained by the bushings. There shouldn't be any slop between the pins and bushings, but the pins can slide back and forth. On the originals the pins are only retained by the bonding between the rubber and the inner sleeve, even though the pin itself is pressed into the inner sleeve. That's why the OE pins have to be tightened at ride height, otherwise the bushings tear free of the sleeves.
With poly bushings I recommend using adjustable strut rods. That way the LCA in held in place in the exact spot it needs to be, so there's no chance the LCA can slide around on the pin.
