Reported: The quest window lists only cards as the reward, but completing the quest also gives Battle Support Equipment.
Found: The game client and the server each keep their own quest data, and the two disagree on these rewards. For most of these card quests, the client's data lists only the cards, which matches what the window shows. The server's data lists the same cards plus Battle Support Equipment, and the server gives every item on its own list, so the extra item arrives without being shown.
The difference is not limited to one quest: the server's data puts Battle Support or Unlimited Support Equipment on 264 quests, while the client's data carries it on only a few.
Planned fix: Quest item rewards will follow the client's own quest data, so a quest gives exactly what its window lists. For the quests in this report that means the cards only, without Battle Support Equipment. Work on it is starting.
To verify: Once the fix is out, complete one of the quests whose window lists only cards, and check that the items received match the window.