If the wheel spindle is true then you need to establish that the fork links are higher /lower one side or the other by getting the scooter perfectly level on level ground and measuring the distances of both fork links.
Have you changed the rebound rubbers and are they the same size?
It is practical and safe to add spacing washers to the tops of the rods to adjust because sometimes the top hats can sit higher/lower. It is not normal but it's not unusual.

