I am travelling to Gatwick airport this Sunday and I am very surprised to see that several trains from Tonbridge to Redhill only have peak fares showing on the Trainline and Southern ticketing websites. For instance, on the 11:30 and 11:58 ex Tonbridge off-peak tickets are not shown as valid but on the 11:36 they are allowed. Is this just a website error or something more serious/sinister? I have the return half of an off-peak ticket and I don't want to miss my flight.