A map screenshot is useful evidence only when others can reproduce what it shows. Name the layer, approximate public location, zoom level, and when you viewed it. If you believe a road or boundary is wrong, compare it with an authoritative public source and link that source rather than relying on memory.
Distinguish a display problem from incorrect underlying data. A label can move at a different zoom, and projections can distort apparent distance. Avoid posting a home address or someone's live position just to demonstrate a discrepancy. State the smallest safe location and the correction you expect; that gives others a clear check without exposing anyone.
Akousa