It really wasn't so light. I buy from a local roaster, usually by country of origin rather than roast color. This was Brazilian.the last one I made had a green pepper flavor/aroma to some people. Drew suggests using a darker roast to prevent this in cold steeped beer.
I've read this posted a couple times lately. I've never had this issue - yet. My go to is usually Sumatra because I love the earthy, cedary aroma and flavor. The other two beans I really like in beer are Espresso and French roasts, being obviously deeply roasted. What coffee did you have this issue with, out of curiosity? It seems like a really lightly roasted coffee like Kona or Blue Mountain would be pretty susceptible to this issue.