Multiple items at play here.
VI Analyzer might have multiple failures on a single test on one VI (such as wire bends - one failure per bad wire, up to the max failures setting).
VI Analyzer counts this as one failed test, even if there are 5 instances of a bad wire.
Checkstyle sees all 5 failures as separate ones. UNLESS the description of the fail matches exactly the description of an existing fail, in which case Checkstyle removes duplicates and reports only one of the identical items.
Options for fix: increment the reported line number (currently hard coded to 0, since line numbers make no sense for us), do nothing, append something to the description (instance N, for example).