It as if the piston rod nut(s) in your pics are upside down with the central sleeve upwards These sleeves need to face the floor and locate the spring top seat centrally. Upside down the height of the sleeved part of the nut will increase the gap as shown. If you undo the strut top nut and remove the cupped top plate, the top of the big nut should be flat and have no raised centre sleeve visible. This sleeve locates the spring top place centrally not the top cup.
You can undo these with the car on the ground if you put spring compressors on first to prevent the springs extending as you do so and change the nuts round, although its not much more work to remove completely and refit on the bench.
Don't over tighten or the steering will be tight should be 48lb/ft which is pretty firm but not as much as a wheel nut.