It was a extract brew with 14 lbs of lme and 6 lbs of grain.
Kiss Brew is probably right. You most likely just didn't get conversion on your grain. I've done it a few times myself.
+1 on the link to Deathbrewer's partial mash technique. It's how I brew 90% of my beers.
Everyone's always in favor of saving Hitler's brain but when you put it in the body of a great white shark, oooooh, suddenly you've gone too far.