It could just be so that you have a true procumbens.
I feel like the scale type foliage, which is never described in its native range, nor in the first arrivals elsewhere, is a result of hybridization.
I have no proof of this other than the fact that it's not present in the original variety, nor in the wild, nor in the ones imported in Europe and Asia, but only in the ones that have been in the United States.
I believe they have been hybridized with horizontalis or similar junipers, but kept most of the traits of the procumbens.
In older age specimens, some might have gone scaley, and have been reproduced for mass market asexually (cuttings, vegetative propagation).
Still a fun species to work with, very tough plants and a good output of growth. I like them.