The answer to 'gutter guards curling shingles' is that improperly installed gutter guards can cause shingles to curl and become damaged. Gutter guards that are too thick or installed too close to the roof can prevent proper airflow and ventilation, leading to heat buildup under the shingles. This heat buildup can cause the shingles to curl, crack, and deteriorate prematurely.
In most cases, the solution is to have a professional roofer remove the gutter guards and inspect the roof for any existing damage. They can then recommend the best type of gutter guard to install that won't interfere with the roof's ventilation. DIY installation of gutter guards is generally not recommended, as improper placement can easily lead to shingle curling and other issues.