In the photos at the links below there seems to be a diagonal, low front to high rear focus plane. In the first photo note the turf, feet and lower legs of the players in the foreground are in focus while their bodies from the thighs up are not. The QB behind them in the center of the photo is in focus from about the thighs up but his knees to the turf less so. He is also leaning slightly backward.
In the second photo the turf in front of the four players is in focus but their bodies are only in focus from about the thighs up.
Why isn't there a consistent vertical focus plane?
Nikon D500, Sigma 120-300mm, f2.8, SS 1/640 (#1) and 1/320 (#2), dynamic 72 point focus points, 300mm focal length (#1) and 155mm focal length (#2), ISO 4000 (#1) and 1800 (#2).