overcount

from The Collaborative International Dictionary of English v.0.48

overcount \o`ver*count"\, v. t.
   1. To rate too high. --Shak.
      [1913 Webster]

   2. To count erroneously, such that the counted number is
      higher than the actual number.
      [PJC]

from The Collaborative International Dictionary of English v.0.48

overcount \o`ver*count"\, n.
   A count[1] that is higher than the true number; an
   erroneously high number determined by counting incorrectly;
   the result of overcounting[2].
   [PJC]

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