Brian,
I know I did not use any giberellins, but yes, they are known to increase spike length.
In this case, the exposure to whatever-it-was had more effect on inflorescences that were farther along in their formation. The lowest flower had about a 1/2" spike and the beginnings of a bud. The middle one was just the typical thickened structure emanating from the crown of the plant, and the tall one was just a gleam in Mommy's eyes.
Whatever caused the twisted spikes (the only thing I can think of is Bayer Once-a-Year Tree & Shrub spray - a Merit-containing product) apparently affected the growth of the spike at the time of application (or for a short while thereafter). The low one was totally affected (along with several other mottled-leafed paphs), the middle one only at first, and the tall one, apparently not at all.
I have some others that have budded more recently, and they are equally unaffected.