Bad scaling. 50Mbps is half of 100Mbps, so the pointer (needle) should be in the middle! Add more technical specs. (used band (2.4GHz, 5GHz) and standard (g,n,ac,ax). Speedtest can fail if a user uses a 8011.g (20MHz) AP and tries to measure anything above 20Mbps... So the measurement in that case is irrelevant!