golf is like lighting. Supposed to not strike in the same place twice. Land on the same exact spot twice, I doubt that.
Think of it this way, ball breaks 1 full grid, you see that both times. You move aim out 1 grid. It looks like you are in the same spot as first game, you think. But because where you are on the green, the angle the ball approaches the hole is 27 degrees one time and 24 degrees the other, one drops, the other doesn't.
There can only be 2 lines into the hole. The one that drops it dead center, and the one that is on the high side and if the speed is correct may drop in the hole as it is turning towards the hole. Most anything else misses, be off just a pixel and keep your fingers crossed.
So many variables to explain your putting woes.