#!/bin/bash

awk '
BEGIN {FS=OFS="\t"}
NR > 1 && tolower($3) != $3 && split($3, a, / +/) >= 2 {
   p = (a[1] == tolower(a[1]) ? 2 : 1)
   $3 = a[p] " " a[p+1]
}
1'