[CQ-Contest] Speaking of editing..."Copy Error"

[Bill Tippett]

         I just looked at my log checking reports for both CQ 
WWs.  Note "copy error" for AF6FU below::


********************* Incorrectly copied *********************

28721 PH 2011-10-29 1426 W4ZV             5 YL2CP           15 
correct     YL2CI
28484 PH 2011-10-29 2112 W4ZV             5 AF6FU            3 copy error
28827 PH 2011-10-30 1536 W4ZV             5 G4DBR           14 
correct     G4DBW
28827 PH 2011-10-30 1547 W4ZV             5 DG3IS           14 
correct     DF3IS
28827 PH 2011-10-30 1725 W4ZV             5 SP9APW          15 
correct     SP5APW
28424 PH 2011-10-30 2253 W4ZV             5 JA3BG           25 
correct     JA3BBG

         Although meaningless since there are zero points involved, 
what does "copy error" mean?  My log entry shows:

QSO: 28470 PH 2011-10-29 2110 W4ZV          59  5      JR1IJV        59  25
QSO: 28484 PH 2011-10-29 2112 W4ZV          59  5      AF6FU         59  03
QSO: 28484 PH 2011-10-29 2112 W4ZV          59  5      AF6FU         59  03
QSO: 28484 PH 2011-10-29 2112 W4ZV          59  5      VE6AX         59  04

AF6FU is clearly a dupe but what would cause the "copy error" 
indication in the report?  AF6FU is listed as being in CA so I don't 
think it was an incorrect zone.

                                         73,  Bill  W4ZV