Pink Oyster reader did not reduce the fare correctly?

Yesterday I traveled from Hayes & Harlington to Tooting Broadway avoiding zone 1 and tapped on the pink reader at West Brompton. The Oyster card is linked to a 16-25 Railcard and the entire journey was off peak. However £1.80 was charged instead of £1.00 (single journey price from the price finder) is this a bug or did I do something wrong?

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Can you tap in on a pink Oyster reader?

You can touch on a pink card reader using contactless (card or device), an Oyster card or Travelcard when travelling on London Overground and the Tube. If you're travelling across London but not through Zone 1, you need to: Touch in on a yellow card reader at the start of your journey.

Do I need to tap the pink Oyster?

If you're not sure whether to touch a pink validator or not then it is usually a good idea to touch it, unless you have a travelcard including zone 1. With PAYG and non zone 1 travelcards you will not normally be charged more by touching a pink validator.

Do I need to tap on pink?

For your journey there is no need to touch a pink reader (although it will do no harm if you do).

What Are Pink Oyster Readers For?

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Anete Lusina, Anete Lusina, Anna Shvets, Olga Lioncat