1986 Topps -- 2 #57 cards??

I have just ripped 2 rack pack boxes of '86 Topps. Can anyone tell me why there are 2 #57 cards? There is a 57 of Braves manager Bobby Wine and another of #57 Bill Doran.
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#51 Bobby Wine, the error
#57 Bill Doran
1996 Select Certified Mirror Gold Ozzie Smith
2006 Bowman Chrome Orange Refractor Chris Carpenter
<< <i>There was also another card with duplicate numbers, but I can't remember which one it is. >>
I think that it was card #68....they never got to 69, but it came with a voucher which stated that "they owed you one" or something to that effect.
* C. PASCUAL BASIC #3
* T. PEREZ BASIC #4 100%
* L. TIANT BASIC #1
* DRYSDALE BASIC #4 100%
* MAGIC MASTER #4/BASIC #3
* PALMEIRO MASTER/BASIC #1
* '65 DISNEYLAND #2
* '78 ELVIS PRESLEY #6
* '78 THREE'S COMPANY #1
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