I have previously found a related problem with my iPad. If you use the iPad camera to take a photo and you happen to have it held the wrong way up, the iPad will correct it for you. If you upload it onto this website, it will display correctly if using the iPad browser, but if anyone else looks at it (or I look at it on a different device), it will be upside down/in the wrong orientation
.
Best to get the photo onto a PC and use whatever software you have there (I think most PCs have MS Picture Manager installed as standard. I'm sure Macs have something similar) to rotate it the right way up before uploading it here.