I'm confused ... is it the EXIF data you are looking at or is it data that is calculated by the website (perhaps from the EXIF data)?
For viewing the EXIF data of online photos, I use the Opanda IEXIF extension for Internet Explorer (it's freeware). Available at:
http://www.opanda.com/en/iexif/index.html
Not sure about Gallery uploads but the EXIF on attachments to a post is not altered in anyway:
http://www.worldphotographyforum.com...8&d=1135384419
The uploaded photo was from a Canon 20D.