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Rootbeer flavor

I made a stout with a grain bill as follows for 10 gallons
21 lb domestic 2 row
2 lb crystal 120
2 lb chocolate malt (350 L)
1 lb flaked oats
2 lb Aromatic malt
1 lb milk sugar

2 oz. centenial (first wort)

wyeast 1332

I got a rootbeer flavor. Not bad just a little distracting. I wouln’t think that this flavor would come fromt he keg as I have had all my kegs for a few years now. Unless it somehow just went unoticed. I haven’t been able to look up rootbeer as an off flavor that indicates a flaw so I don’t really know were this came from. Any ideas?

Thanks for you time

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