Why does it hurt when you push really hard on the subtalar joint axis?

One observation that I noticed a while back is that if you push really really hard on the STJ axis on the plantar surface of the foot then, 6-7 times out of 10 it hurts; for the rest it is uncomfortable. If you move the finger a few mm off the axis and do it again, it does not hurt or is not uncomfortable and certainly feels different to pushing right on the axis

One observation that I noticed a while back is that if you push really really hard on the STJ axis on the plantar surface of the foot then, 6-7 times out of 10 it hurts; for the rest it is uncomfortable. If you move the finger a few mm off the axis and do it again, it does not hurt or is not uncomfortable and certainly feels different to pushing right on the axis

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Why does it hurt when you push really hard on the subtalar joint axis?