The answer to 'why is my downspouts curling shingles' is that improper downspout placement or drainage issues can cause water to pool near the roof, leading to shingle curling and damage. This happens when water from the downspout is not directed far enough away from the home's foundation, causing it to accumulate and saturate the shingles.
Curling shingles can also be a sign of aging or poor-quality shingles that are reaching the end of their lifespan. However, if the curling is isolated to areas around the downspouts, the issue is likely due to improper drainage. To fix this, you'll need to adjust the downspout placement or add extensions to direct water further away from the home.