It happens sometimes, especially with retail or other parallels. Sometimes it's just hard to tell. Although on the 1997 Finest refractors it says "Refractor" right next to the card number.
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Collecting: Brett Favre (7,771 unique as of 6/1/2015), Packers, UW Huskies (Shaq Thompson, Shelton, Peters, Kikaha, Sankey, ASJ, Trufant, Locker, Brunell, Dillon, etc.)