The answer to 'why is my metal roof missing shingles' is that metal roofs do not actually have shingles. Metal roofing is a single continuous sheet or panel system, rather than overlapping shingles. If you are seeing missing or damaged sections on your metal roof, it is likely due to issues like improper installation, fastener failure, or weathering and wear over time.
Some common causes of missing or damaged metal roofing include high winds, hail, snow/ice buildup, and general aging of the roof. Symptoms may include visible holes, warping, or detached panels. Solutions typically involve repairing or replacing the damaged sections, which is best done by a professional roofer unless the issue is very minor.