The answer to 'why is my fascia missing shingles' is that the fascia board, which is the horizontal board that runs along the edge of your roof, has likely become damaged or deteriorated, causing the shingles to come loose and fall off. This is a common issue that can be caused by weather exposure, poor installation, or just general wear and tear over time.
Some common symptoms include visible gaps or holes in the fascia, rotting or crumbling wood, and shingles that are curling, cracked, or missing. If left unaddressed, this can lead to further roof damage, water leaks, and even structural issues with your home.