The answer to 'why is my drip edge cracked' is that the drip edge has likely become brittle and cracked due to exposure to the elements over time. Drip edges are typically made of metal, such as aluminum or galvanized steel, and can crack or split as they age and weather.
Some common causes of cracked drip edges include UV exposure from sunlight, temperature fluctuations, and water damage. Over time, the metal can become oxidized and lose its flexibility, making it more prone to cracks and breaks. This is especially common on older roofs or in harsh climates with extreme temperatures and weather conditions.