Sorry, this isn't a bug. -k1,$n doesn't sort on the first $n fields but on the numeric prefix of the first $n fields, i.e. the `/' tab character separating fields 1 and 2 stops the comparison.
** Changed in: coreutils (Ubuntu)
Status: Confirmed => Rejected
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sort's -u is Failing to Check all -k fields for Uniqueness.
https://launchpad.net/bugs/56891
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