Runsheet with Macro Issues (Run-time Error '13': Type Mismatch)

Because once you delete the row, the cell value become unknown. Maybe put an error handle procedure

Private Sub Worksheet_Change(ByVal Target As Range)
On Error GoTo ExitSub
    If Target.Value < 0 Or Target.Value > 1 Then Exit Sub
    Application.EnableEvents = False
    Target.Value = Target.Value / 60
    Target.NumberFormat = "[m]:ss"
    Application.EnableEvents = True

ExitSub:
End Sub