I had the same occurrence on both CQ WW and ARRL 160. On 160 I moved after 10 Dupes in a row.
In CQ WW, one of the callers asked whether I was N1URF. So after the contest I looked for any manual spots for N1URF and didn't find any. So it was a busted Skimmer spot I assume. People seem to be trusting what they see on the screen and its guaranteed that they will be wrong some of the time doing that. Ed N1UR _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector