Variable Weird Behavior

WeirdBehavior.ps1

function GenerateRainbowTable {
  param(
    [int]$size,
    [char[]]$Charset = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
  )
  foreach($char in $Charset) {
    if($size -eq 1) {
      $char
    } else {
      GenerateRainbowTable -Size ($size -1) -charset $charset | foreach { return "$char$_"}
    }
  }
}
function MatchEntry {
  param($entry,$regex,$object = $null,$index = 0,$Size)
  foreach($entryItem in $entry) {
    if($index -eq 0) {
        $object = @{}
        0..($Size-1) | foreach-object {$object.add($_,'') }
        $object = new-object pscustomobject -Property $object
    }
    if ($entryItem -match "^($($regex[$index]))$") {
      if($index -lt ($size-1)) {
        $object.$index = $entryItem
        MatchEntry -entry $entry -regex $regex -index ($index+1) -Size $Size -object $object 
      } else {
        $object.$index = $entryItem
        $object 
      }
    } 
  }
}
$size = 2
[array]$RainbowTable = GenerateRainbowTable -Size $Size -Charset 'HEFP'
[string[]]$Row = ('HE|LO|O+','[PLEASE]+','EP|IP|EF')
# I will return fine to console
MatchEntry -entry $RainbowTable -regex $Row -Size $size


# I only return the last object overwriten all entries
$Variable = MatchEntry -entry $RainbowTable -regex $Row -Size $size
$Variable