Hey guys,
Sorry to pull this back from the dead but I ran into the same exact issue... In my case, I've given Delem all three birds and attempted to have him eat all 3 but the quest won't end (no experience, nothing, he just asks for more birds) upon having him consume the third and final bird. As was reported earlier by rezaremba, I opted to return to Delem after each bird was located and did not give him all 3 birds at once. This apparently is causing some kind of issue... See my 2 saves and output log(s) on Dropbox at the link below!
https://www.dropbox.com/sh/v4hco7798nq7kba/AAA0iGBtWLslZIsKfARCUk1La?dl=0