I make alot of Hefes. I have had a few that had a sour taste/smell when I racked them to my keg, but were perfectly fine a few weeks later. I can't explain it, but if I were you, I'd just stick with it and it will likely condition out.
Primary #1 - Midnight Ryeder (Midnight Wheat and Rye)
Primary #2 - Florida Weiss
Primary #3 - Kane-DOH APA (Honey Citra APA)
Secondary #1 - Downtown Flanders Brown (brewed August 2012)
Keg #1 - Raspberry Florida Weiss
Keg #2 - Cinnamon Raisin Cider
Keg #3 - NONE!
Bottled - NONE!