Why does the Moogle Treasure Trove event give you incompletable weekly challenges?

[Duz]

I've been doing Rival Wings for a few hours each evening on Primal. The queues slow down the later the night goes, but they are definitely popping.

[Nephie]

not sure when you've been doing it but i've been in a queue for 5 hours now from 10am to 3pm PST, and it was the same the days before when i queued at 4pm to 10pm PST. i guess you got lucky