Civic diplomacy cards from buffs go away?
I would like to know whether the cards you get from the buffs given by a sufficiently pulled lever are supposed to stick in your collection of Diplomacy cards or poof when the buff ends. On my server (Shidreth), Khal always has 2 or 3 active Civic Diplomacy buffs going, sometimes 4, and often, I learn a new ability just by being there. This has happened 3 times so far.
The first time it happened, I learned Crucible of Words, and I've kept it ever since, incorporating it into my strategy over time. The next two times it happened, I forget the card abilities because they poofed as soon as the buff ended.
Is this intentional? Is it just the type of buff that determines whether the card is permanent, or is this a bug? Since it's happened to me both ways, I can't tell. Again, one time I got a card I kept, twice more I got cards that poofed later.