Old post but I just had the same issue with an "Apricot" wit brew. I think it was from the can that I used for my apricot puree that a racked to the secondary in. Tastes very similar to the sample I had before I racked it. Just guessing, but if that's the case I would say to be cautious of the material that your ingredients come in. They may impart undesirable flavors even if they say they are "pure". Pure ingredients shipped in non-inert containers may have undesirable effects a month or two down the road.