iPad and iPhone browser rotating images on site?
Uuuh .. I do not have any Apple device or browser to check .. but it looks like they reading EXIF metadata (in particular rotation).
I have opened one of this images in XnView -- image is displayed 90 degrees rotated.
Try removing all extra info from these images (do it for at least one image). Use image compressors, like this one: punypng.com (or any other tool that can remove metadata details .. or just rotate it and save again) and replace your image with "optimized" version.
When checking again on iPad, make sure the browser has current image version, so clear caches.
P.S. Thnx Su'