The answer to 'why is my flashing clogged gutters' is that clogged gutters can cause damage to the flashing on your roof. Flashing is the metal or plastic material installed around roof penetrations and edges to prevent water leaks. When gutters become clogged with leaves, debris, and other materials, water can back up and overflow, leading to water damage on the flashing. This can cause the flashing to deteriorate, rust, or become dislodged over time.
Some common symptoms of clogged gutters affecting the flashing include water stains on the interior walls or ceiling, mold or mildew growth, and visible gaps or holes in the flashing. To fix this issue, you'll need to clear out the clogged gutters and inspect the flashing for any damage. Depending on the extent of the damage, you may be able to repair the flashing yourself, but for more serious issues, it's best to call a professional roofing contractor.