If you create a New Workbook and enter ctrl+; (semi-colon) what does it show ? Please show us an image including the formula bar for the cell.
Then click on the date for John Williams in Excel and show us an image including the formula bar.
Private Sub populate()
' clear the Listbox
Me.ListBox2.Clear
' declare variables
Dim i As Long, lRow As Long, ws As Worksheet
' set ws to the desired sheet
Set ws = Application.Worksheets("POSTAGE")
' determine the last row of that desired sheet
lRow = ws.Cells(Rows.count, 1).End(xlUp).Row
' populate the Listbox by looping down the rows of ws
With Me.ListBox2
For i = lRow To 8 Step -1
'determine if this customer should be added to combobox list
If UCase(ws.Cells(i, 7).Value) = "POSTED" Then
.AddItem Cells(i, 2) 'adds the customer name to combobox first column
.List(.ListCount - 1, 1) = Cells(i, 1) 'add the date to second column of line just added
.List(.ListCount - 1, 2) = Cells(i, 3) 'add the item to third column of line just added
End If
Next i
End With
End Sub