Sometimes our subconscious vetoes our aiming decisions because it knows we're not good enough for that aim yet. Here's a pic I've posted before illustrating what I mean.
Nobody hits their tip/ball target exactly every time - we make "shot groups" around it - better strokes hit closer to their target, creating smaller "shot groups". Tighter shot groups allow us to aim closer to the limit without miscuing too often. Our subconscious learns this limitation, sometimes better/faster than we do - and it can "intervene" when we get too ambitious, steering our stroke a little to a safer "target".
Black circles below are miscue limits. Blue dots are shot groups; red dots are safe targets for each.
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