The reason biscuits hold together so well is because of the gluten in wheat. Without that, baked goods tend to not hold together as well. While these biscuits are far from crumbly, you'll definitely notice a different texture. That's normal for gluten free biscuits. Enjoy them with a little jam if you like. If you don't like the texture, and don't need to eat gluten free, you can use 1/2 buckwheat flour and 1/2 whole wheat flour for a biscuit that holds together more like what you're used to.