Was looking for two tickets (me and Mrs) and noticed that there is only one available for the flight I wanted at the lowest price as it showed ...T9 L9 K1.
So I bought the first ticket for her (I can use the higher PQD) and then to my surprise, when I searched again for myself it still showed T9 L9 K1 and I was able to buy another one in K for the same price. Ticketing went through as well. And I wasn't in a real rush so a couple minutes passed between the two (although I might have searched for the second ticket before the first eticket arrived).

If I search now (about 10 min later), it does show K0.

No complaints here, but wouldn't it be problematic in general if availability is not updated right away (i.e. selling the last seat multiple times)? Maybe it's just a glitch, because this is not the first time I buy separate tickets to take advantage of a single spot at a lower price, and this never happened before.