Genetics can casue it (crappy seeds) among many other things.
How did the trichromes look before you harvested? Percent of clear, milky, and amber. How many weeks into flower did you pull it? I pulled one too early one time because of a light and fert problem that was my own doing. Caused all the pistols to turn early and curl, but the trichromes weren't exactly ready. Leaf trichs were ALL amber (you dont go by the leaves, just the bud) and i thought i saw some on the buds too, but I was wrong. Result was a week smoke with little to no taste. Not saying that's what this is, just one thought of what could have happened from one of my previous experiences.
No diary and little information to go off of, means people can only make guesses.
Best of luck in the future and Happy Growing!