Problem in logging with duplicates

larry fields
 

   Problems with my Ham log is when I go through it I found many mistakes I never added. For example I add a VK6? or HL1? and when I do the dxcc it will show where I also worked the same station in duplicate forms, or on frequency's I never did. Many are 6 in a row. I have to go through it manually and remove some. My log is over 10,000 and last count I got 10,550. I I remove some it drops it down around 200 mistakes. 

  Anyone else have this problem.

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