Duplicated output

[KurtBuff]

This script produces 4 lines of output for each item:

$computers = Get-PSWSUSClient -IncludedInstallationState failed -IncludeDownstreamComputerTargets ;
$failed += foreach ($computer in $computers) { Get-PSWSUSUpdatePerClient $computer -UpdateScope (New-PSWSUSUpdateScope -IncludedInstallationStates Failed) } ;
$failed | sort ComputerName,UpdateKB | ft -auto

I have dealt with it by using the -unique parameter for sort, but it seems peculiar.