The answer to 'why is my flashing clogged gutters' is that clogged gutters can cause water to back up and get behind the roof flashing, leading to leaks and damage. Flashing is the metal or plastic material used to create a waterproof seal around roof penetrations like chimneys, vents, and edges. When gutters are blocked with leaves, sticks, and other debris, water has nowhere to flow and can seep under the flashing, causing it to corrode and deteriorate over time.
To fix this issue, you'll need to thoroughly clean out your gutters and downspouts to restore proper drainage. This is a task that can often be done DIY, but may require a professional if your gutters are in poor condition or difficult to access. If the flashing itself is damaged, a roofing contractor will need to inspect it and make any necessary repairs or replacements.