I followed a recipe and did it by the letter, the ingredients, the temperature, the rennet, everything and it came out crumbly. I don't understand why.
Did you knead and pull the curds, reheating them as necessary?
This is the recipe I usedFrom my limited knowledge its that kneading and pulling stage which turns curds to stringy mozzarella.
Do you have a link to the recipe you used Puggles?