I'm no vet, but it looks more like a localised muscle spasm or contraction to me, rather than skeletal. Some snakes do have spinal or muscle problems which can show up like this from hatch, and they live quite normal lives. If you haven't seen it before, it may be a reaction to pain (something may have triggered it when it fed).
In the photos, the head is correctly oriented, which may be a good sign. If the animal was fully disoriented and the head is difficult to maintain on a normal plane, it could point to a more serious neurological problem, but my best guess is that this isn't the problem.
Although this is a localised abnormality, Stimmies are able to flatten themselves out more than most pythons - they squeeze into narrow rock crevices and under rock slabs. This characteristic makes them great escape artists, they often work at getting between sliding glass panels in their enclosure.
Jamie