Powershell Jobs not returning what I expect - multithreading

Question

I have this PowerShell script that reads lines of integers from a file and creates a new job with $CHUNK_SIZE amount of lines to get the sum of all the prime numbers until the end of the file. The $MAX_THREADS is the amount of jobs hat can be running at the same time, I'm testing with 1, but will change to 2, 4, and 8 later. I wait for all the jobs to complete and then receive all the subtotals from the jobs to get the actual sum of all primes in the file. My problem is that the accumulated total at the end should be 2844292, but I keep getting 2766271. I have checked my prime function and whats being read from the file and being sent to the job - but they do not seem to be the problem. When I look at my output, I notice that I receive the same value twice in a row for the last two jobs..i'm not sure why that's happening.
These photos show my output:
1.Get-Job Info
2.What I get back from Receive-Job and my total increasing
Any help as to why my total is off would be greatly appreciated! Thanks!
Set-StrictMode -Version latest
$CHUNK_SIZE = 1024
$MAX_THREADS = 1
$scriptBlock = {
param($chunkArr)
function isPrime([int]$data){
if($data -lt 2){return $FALSE}
if($data -eq 2){return $TRUE}
if($data % 2 -eq 0){return $FALSE}
for($i=3;$i*$i-le$data;$i+=2){
if($data % $i -eq 0){return $FALSE}
}
return $TRUE
}
$total = 0
foreach($line in $chunkArr){
$data = [int]$line
if(isPrime $data){
$total += $data
}
}
$total
}
$eof = $FALSE
$reader = New-Object System.IO.StreamReader("$PWD/ass2-20000.txt")
$chunkArr = New-Object System.Collections.ArrayList
while(!$eof){
$chunkArr.Clear()
for($i=0;$i -lt $CHUNK_SIZE;$i++){
$line = $reader.ReadLine()
if($line -eq $NULL){
$eof = $TRUE
break
}
$chunkArr.add($line) | Out-Null
}
While(#(Get-Job -state running).count -ge $MAX_THREADS){
Start-Sleep -Seconds .2
}
Start-Job -ArgumentList (,$chunkArr) -ScriptBlock $scriptBlock
}
While(#(Get-Job -state running).count -ge 1){
Start-Sleep -Seconds .2
}
Get-Job
$total = 0
foreach($job in Get-Job){
$tmp = Receive-job $job
Write-Output ("Recieved: " + $tmp)
$total += $tmp
Write-Output ("Total: " + $total)
Remove-Job $job
}
$reader.Close()
$total
EDIT: this image shows what the jobs should be returning, the last line showing the correct total..it seems my first job is never being received and my last one is being received twice
EDIT: Compare What I should be getting from each Job to What I actually get