Solved: strange Unload Me behaviour

[ndendrinos]

These are the codes:

Private Sub Workbook_Open()
Sheets("Invoice").Activate
Application.EnableEvents = False
    Range("A17:D35").ClearContents
    Application.EnableEvents = True
UserForm20.Show

End Sub

 Private Sub CommandButton1_Click()
lastnum = Range("F2").Value
If lastnum = "" Then
    invoicenumber = 1
Else
    invoicenumber = lastnum + 1
End If
Range("F2").Value = invoicenumber
Dim ctl
    For Each ctl In Me.Controls
        If TypeOf ctl Is msforms.TextBox Then
            ctl.Text = ""
        End If
    Next ctl
[F3,F5,F6].ClearContents
TextBox1.SetFocus
End Sub

Private Sub CommandButton2_Click()
Unload Me
End Sub

Private Sub CommandButton3_Click()
[A1].Activate
Unload Me
[B8].Activate

End Sub

The problem is with the "Unload Me" of comdbutton2

If I close and save the workbook while in any sheet except "Invoice"
comdbutton2 behaves normally.

IF while the workbook is open I navigate from any sheet to "Invoice" then again comdbutton2 behaves normally.

BUT if I close and save the workbook from sheet "Invoice" when I reopen the workbook it takes clicking twice the comdbutton2 to close it.

Is there something obvious that I'm missing?
Thank you

[ndendrinos]

I think I solved this by moving cmdbutton2 to the top of the tab routine.( the original order was cmdbutton1 then2, then3)