The Favor Curry Quest text reads:
"Visit your favorite Shrine and give until it hurts. Or until you get 100 favor points. Whichever comes first. (Weaselly small print: Shrines where you've already earned 100 favor points don't count.)"
Which seems to imply that you have to gain 100 pts at your favorite shrine. However I gained 65 pts at one shrine, and 40 at another, and then this quest was marked as completed. I'm not sure this is a bug per se, but maybe the text could be clearer.