Retrieving data from a closed book using an ADODB connection. Is some data missing?

I am currently writing code that can access a single workbook through an ADODB connection. I chose this instead of other methods because of speed. Here is my code below:

    Sub GetWorksheetData(strSourceFile As String, strSQL As String, TargetCell As      range)
    Dim cn As ADODB.Connection, rs As ADODB.Recordset, f As Integer, r As Long
    If TargetCell Is Nothing Then Exit Sub
    Set cn = New ADODB.Connection
    On Error Resume Next
    cn.Open "DRIVER={Microsoft Excel Driver (*.xls)};DriverId=790;ReadOnly=True;" & _
    "DBQ=" & strSourceFile & ";"
    ' DriverId=790: Excel 97/2000
    ' DriverId=22: Excel 5/95
    ' DriverId=278: Excel 4
    ' DriverId=534: Excel 3
    On Error GoTo 0
    If cn Is Nothing Then
    MsgBox "Can't find the file!", vbExclamation, ThisWorkbook.Name
    Exit Sub
    End If

    ' open a recordset
    Set rs = New ADODB.Recordset
    On Error Resume Next
    rs.Open strSQL, cn, adOpenForwardOnly, adLockReadOnly, adCmdText
    ' rs.Open "SELECT * FROM [SheetName$]", _
    cn, adOpenForwardOnly, adLockReadOnly, adCmdText
    ' rs.Open "SELECT * FROM [SheetName$]", _
    cn, adOpenStatic, adLockOptimistic, adCmdText
    ' rs.Open "SELECT * FROM [SheetName$] WHERE [Field Name] LIKE 'A%'", _
    cn, adOpenStatic, adLockOptimistic, adCmdText
    ' rs.Open "SELECT * FROM [SheetName$] WHERE [Field Name] LIKE 'A%' ORDER BY [Field                 Name]", _
    cn, adOpenStatic, adLockOptimistic, adCmdText

    ' optional ways of retrieving a recordset
    ' Set rs = cn.Execute("[A1:Z1000]") ' first worksheet
    ' Set rs = cn.Execute("[DefinedRangeName]") ' any worksheet

    On Error GoTo 0
    If rs Is Nothing Then
    MsgBox "Can't open the file!", vbExclamation, ThisWorkbook.Name
    cn.Close
    Set cn = Nothing
    Exit Sub
    End If

    'RS2WS rs, TargetCell
    TargetCell.CopyFromRecordset rs ' optional approach for Excel 2000 or later

    If rs.State = adStateOpen Then
    rs.Close
    End If
    Set rs = Nothing
    cn.Close
    Set cn = Nothing
    End Sub

Now this code works, however, when the string contains mixed data types, the query skips some values. For instance:

Initial data:

    3844774 12505604
    3844794 12505604
    4266113 3281271
    4295817 1307HX

Returned data:

    3844774 12505604
    3844794 12505604
    4266113 3281271
    4295817 

Note that the last bit of data is skipped. This is true for multiple entries, but only for those that contain letters (which makes the text). The source table also has everything that is indicated in the text. Any suggestions so that he doesn't skip these lines?

Thanks in advance!