In your camera phone app, the pic looks correct... and is. But then when its transferred to the forum not all the info apparently makes it there. So what you can try is to view the image with your phone and before you post it, Try a simple edit. I use the crop feature. I don't really crop it but just make a slight change to the picture in the camera. Then save the image. Pay attention to where the camera saves it to. Mine saves the the edited Image in a different folder but says where it was saved. When you post it, post the edited image. Don't ask me why but even though I don't edit the orientation at all, the image then posts correctly. I've tried this multiple times now as I have tried to find a way to make the phone pics easier to upload. Its worked 100 % of the time and literally only takes a moment more to do...
I don't think it matters what edit you Make.. I tried a few and they all work for me, for instance I put a photo "frame" effect around it, saved the image and it posts in the correct orientation.
al