PowerShell script pipeline only taking one record

This started off as a "why doesn't my pipepline input work, but I tested today and it kind of did work.  Previously it didn't read anything.  Now the PowerShell script pipeline only is only taking one of the records I put in the CSV file.  Strangely it is taking the last record.  I only tested with two records this time and the second was created.  Here is my code:

Param 
(
    [parameter(Mandatory=$true,ValueFromPipelineByPropertyName=$true)]
    [string]$SamAccountName,
    [parameter(Mandatory=$true,ValueFromPipelineByPropertyName=$true)]
    [string]$GivenName,
    [parameter(Mandatory=$false,ValueFromPipelineByPropertyName=$true)]
    [string]$Initials,
    [parameter(Mandatory=$true,ValueFromPipelineByPropertyName=$true)]
    [string]$SurName,
    [parameter(Mandatory=$true,ValueFromPipelineByPropertyName=$true)]
    [string]$EmployeeID,
    [parameter(Mandatory=$true,ValueFromPipelineByPropertyName=$true)]
    [string]$Title,
    [parameter(Mandatory=$true,ValueFromPipelineByPropertyName=$true)]
    [ValidateSet("BES","CES","EES","GES","NES","PES","WES","JHE","JHW","SHS","DEC","DIS","DSS","Substitutes","TEST")]
    [string]$Building,
    [parameter(Mandatory=$false,ValueFromPipelineByPropertyName=$true)]
    [Int]$Enabled = $true,

    [parameter(Mandatory=$false,ValueFromPipelineByPropertyName=$true)]
    [Int]$EnableMail = $true
)

CSV import file has headers that match the properties for AD Users with the exception of "EnableMail".  They are: SamAccountName, GivenName, Initials, SurName, EmployeeID, Title, Building, Enabled, EnableMail. 

Using the following command it works:

PS D:\PowerShell> import-csv .\User-New.csv | % { .\User-New.ps1 -sam $_.SamAccountName -g $_.GivenName -i $_.Initials -sur $_.SurName -emp $_.EmployeeID -t $_.Title -b $_.Building -Enabled $_.Enabled -EnableMail $_.EnableMail }

Using this command it takes only one record:

PS D:\PowerShell> Import-Csv .\User-New.csv | .\User-New.ps1

I do not have any sort of foreach in the code inside the file.  Any suggestions that would help fix things.  I know I didn't post much, but hopefully someone knows what is happening.

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