OK, I'm a bit confused as well. If I just look at the source code the standard way in Firefox, I don't see any difference. But when I look at it through "View Source Chart 3.02" plug-in, I do. And the default theme has that extra bit, the dupe doesn't.
But one way or the other, the exif link fails in the dupes, where it works in the original. Hitting the link just sends me to the top of the page.
I tried it with the new Garland theme as well and had the same problem. Works in the orig, unmodified dupe fails. And just for good measure, I checked it in Chrome and same thing. Link does and doesn't work, depending on which copy, and source codes look the same.