I have no idea myself, but is the ground around each hole on a golf course sloped even a little such that the ball has some ‘help’ rolling in? Or is it perfectly level?
They’re practically never level, but I find that hurts more than helps in most situations. (nothing helps me ;)) There’s also several different hole placements on every green, so if you played yesterday and liked that placement you may show up today and the hole is ten yards behind and to the left of where you liked it.