The picture is probably oriented upside down. If you are using Windows 7 sometimes when you look at it, Windows 7 automatically corrects the orientation your viewing but not the pic itself.

To Correct:
1. Open Windows Explorer (Icon Looks like a FILE in bottom left)(NOT Internet Explore)
2. Locate your photo. Note the thumbnail is the true orientation.
3. Right Click on Photo
4. Select Rotate Clockwise, then Right Click again Rotate clockwise one last time.

Should now be fixed and you can re-Upload it