I hear you.. I wrote a small exif php and I'm getting exif information from the server but I clearly is missing something obvious but just can't figure out what.
It's only when uploading 'natively' from an iPhone I can reproduce this issue in our forum, if I transfer the file to a windows machine via cable, e-mail or iCloud the photo will upload with the correct rotation. And, as I wrote before, in your test forum it uploads correctly so there is something in our end but right now I'm clueless. 😞