Why is the first 4 Characters of the Filename Getting Truncated

I have the following code, but when it gets to Line 17 of the code, it's truncating the beginning of the FileName, which in turn makes the Do While FindNextFile fail and then the cursor moves to "FindClose nFind".

Function FindFolders(strStartDir As String, strResults() As String) As Long 'NOTE: this is non recursive, so the results will only show for the given folder
  On Error GoTo ErrHandler
  Dim wfd As WIN32_FIND_DATA
  Dim nFind As LongPtr
  Dim strDirectoryName As String
  ReDim strResults(0) '0 will not be used
  
  'if there is already a wildcard then leave the StartDir be (example for user passed is C:\blah\T* = all folders that start with a T
  If InStr(1, strStartDir, "*") < 1 Then
    If Right(strStartDir, 1) <> "\" Then strStartDir = strStartDir & "\"
    strStartDir = strStartDir & "*"
  End If
  

  nFind = FindFirstFile(strStartDir, wfd)   'api call
  If (wfd.dwFileAttributes And FILE_ATTRIBUTE_DIRECTORY) > 0 Then     'if this is a directory
     strDirectoryName = Left(wfd.cFileName, InStr(1, wfd.cFileName, Chr(0)) - 1)
     If strDirectoryName <> "." And strDirectoryName <> ".." Then
       ReDim Preserve strResults(UBound(strResults) + 1)
       strResults(UBound(strResults)) = strDirectoryName
     End If
  End If
  Do While FindNextFile(nFind, wfd)
    If (wfd.dwFileAttributes And FILE_ATTRIBUTE_DIRECTORY) > 0 Then  'if this is a directory
      strDirectoryName = Left(wfd.cFileName, InStr(1, wfd.cFileName, Chr(0)) - 1)
      If strDirectoryName <> "." And strDirectoryName <> ".." Then
        ReDim Preserve strResults(UBound(strResults) + 1)
        strResults(UBound(strResults)) = strDirectoryName
      End If
    End If
  Loop
  
ErrHandler:
  FindClose nFind
  FindFolders = ErrorHandler(err, "FindFolders")
End Function

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Thanks,
gdunn59