Thanks! Confirmed we are looking at it: Gaga should offer the ride to the baby bird's nest (level 13+) so you can start the Lost Snipe jump quest, and talking to him over and over should not keep handing out feathers. Fix is being worked on now; I'll post here when it is live with what to re-test.

Fixed and live (refresh the game). Gaga's ride was fine; the problem hit anyone who had already finished The Lost Snipe once. After that, the Snipe on the Nest of a Baby Bird stopped offering her jump stands, so there was no way back to the jump. On top of that, Gaga's egg on the nest hatched a new Baby Bird Feather every few talks forever, which is where your feathers came from. Now: talk to Gaga in Henesys, pick "Send me to the baby bird's nest", then talk to The Lost Snipe and choose "Will you help a lost Longbill Bird?" and a stand. It works even if you've done the quest before (a repeat run gives no new prize). The egg now only hatches while The Baby Bird's Feather quest still needs its feather. And since you finished the Snipe's quest before her Chicky Face Decoration prize existed, one is waiting for you in your notifications.