Just booked a club return to MCT (Muscat) via the app, selecting cheapest price radio button. The price looked about right, but when I went into MMB to sort out seats etc on the full website, and carried out a dummy booking for my own curiosity, the price dropped by £500. The fare class also changed, to a semi/non flex ticket, wheras the app had the return leg in J (despite asking for the cheapest flight.)

I retried the app with a dummy booking, and got the same price as booked (i.e. the +£500 one). Fortunately the 24 hour cooling off period is live, so I am safe to cancel, but don't think I'll book via the app again.

U