In both photos, gathered and un-gathered, your overskirt looks shorter on the right side (your right). I can't say why it's doing that, but mis-cutting pieces happens all the time and it's easy to attach part of a skirt higher on a waistband than the other parts. I suspect it's the way the pieces were cut, since your underskirt is also longer in the front than at the sides.
How to fix?
Option A: enjoy (and emphasize) the asymmetry, because for several years it was a fashionable arrangement for skirts of that type.
Option B: Undo whatever hem treatment you've got, trim the skirt into a symmetrical shape, and re-hem.
If you go with Option A, I'd recommend spending the bulk of your time on trimming and embellishment, also in an asymmetrical manner, so the cut of the skirt looks more intentional. Victorians loved trim like vultures love a carcass; go nuts.