The answer to 'why is my drip edge curling shingles' is that improper installation or poor quality of the drip edge can cause the shingles to curl. This happens when the drip edge is not properly secured to the roof deck or is made of a material that is not compatible with the shingles. Over time, the drip edge can expand, contract, or become loose, leading to the shingles lifting and curling at the edges.
To fix this issue, you may need to replace the drip edge entirely. This is typically a job best left to a professional roofer, as improper installation of the new drip edge can lead to further damage. A roofing expert will be able to assess the extent of the damage, choose the right materials, and properly install the new drip edge to prevent future curling.