Canon 17-40 Exif data

I don't believe that AF will be affected but your PP software might apply distortion profiles (barrelling/pincushion) based on the reported focal length
 
If you have more than one body, does it behave the same on both? Do other zooms report variable focal lengths as expected on these bodies? Have you tried alternative Exif viewers, including this online viewer?: http://exif.regex.info/exif.cgi
 
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