Duplicated page numbers in references - why?

[Daren Scot Wilson]

My math paper is almost done, but:  Page numbers in references are 
rendered in duplicate!  I don't see what's causing this.

My doc's Lout source contains:

{
  @Reference
  @Tag {kneser50}
  @Type {Article}
  @Author {Hellmuth Kneser}
  @Title {Reel analytische Losungen der Gleichung @M{phi(phi(x))=e sup 
x} und
verwandter Funktionalgleichungen}
  @Journal {J. f. Reine Agnew. Math.}
  @Volume {187}
  @Page {56}
  @Year {1950}
}

and comes out in PS or PDF like this


[3] Hellmuth Kneser. Reel analytische Losungen der Gleichung φ(φ(x)) = e 
x und verwandter
Funktionalgleichungen. J. f. Reine Agnew. Math. 187, page 56, page 56 
(1950).

Screen cap uploaded to 
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Daren Scot Wilson
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