Why are some lines in my output being duplicated and others not?

SPF Item        IP in EFD Count
--------        ---------------
67.231.157.188              119
67.231.149.193              118
67.231.149.193              118  *Duplicate*
67.231.149.193              118  *Duplicate*
170.48.2.165                  0
170.48.2.165                  0  *Duplicate*
170.48.2.165                  0  *Duplicate*
185.132.180.109              44
185.183.28.71                40

#Import all CSVs
$spflist = Import-Csv -Path "C:\psscripts\input\SPF.csv" -Delimiter : -Header Mechanism, Value
$EFDLast30Days = import-csv -path "C:\psscripts\input\CignaSendingIPs.csv" | Select Sender, IPAddress

#Import module used to validate IP addresses
Import-Module -Name "C:\psscripts\validate-ip.psm1"

$spfitem = @()

# Determine SPF Mechanism in use: ip4:(address or CIDR),ip6, or domain (include:)
foreach ($spfitem in $spflist) {
    # Select lines in SPF that start with ip4
    if ($spfitem.Mechanism -like "ip4") {
        [string]$spfip4 = $spfitem.Value
        # Determine if ip4 value is IP address or CIDR
        $check = confirm-ipv4 -ipaddress $spfip4
        if ($check -eq "True") {
            $isIPfound = $spfip4
            # If "True" then value is regular IPv4 address
#                $spfIPfoundinEFD = ($EFDLast30Days.IPAddress).Where( { $_ -like "*$isIPfound*" }) | Measure-Object
            $itemcount = ($findip = Select-String -Pattern $isIPfound -Path "C:\psscripts\input\CignaSendingIPs.csv" -AllMatches).Matches.Value
            $ipcount = $itemcount.count
            }
    $columns = New-Object -TypeName PSObject -Property @{"SPF Item" = $isIPfound"IP in EFD Count" = $ipcount
        }
    }
    $columns
}