It could just be the plant. I have seen plants from the same seed run grow vastly differing sized colas. From pinched marble sized colas lost in leaves on one plant to a full donkey dong with few leaves on another plant. Genetic expression is a bitch. Don't give up on your plant though...those little buds can be the stickiest and while they may not have "bag appeal" they may be your favorite smoke ever. Never give up on your ladies.