Soffit panels are light and are held by their attachment to the framing above and by their engagement in the receiving channel. When a run sags away from the framing along one elevation, the usual reason is that the material it fastens to has softened — the fascia backing, the sub-fascia or the rafter tails have been wetted repeatedly and have begun to decay, so fasteners lose their grip. That wetting most often comes from above: an overflowing or leaking gutter, missing drip edge, or ice damming pushing water back under the roof edge. So the sagging panel is a symptom pointing upward into concealed framing, and the inspector's job is to read it that way and look for the water source rather than to report a loose panel. Confining the report to the soffit itself would describe the least important part of the finding.