The answer to 'why is my shingles cracked' is that cracked shingles are often caused by age, weather exposure, or improper installation. As shingles get older, the materials can become brittle and crack over time, especially if they've been subjected to extreme temperatures, UV radiation, or water damage. Shingles that were not installed correctly may also be more prone to cracking.
Cracked shingles can lead to leaks and further roof damage if not addressed. If you notice a few cracked shingles, you may be able to replace them yourself. However, if the cracking is widespread or the roof is older, it's best to call a professional roofer to inspect the entire roof and make necessary repairs.