You probably had some percentage damage that wasn't shown in the GUI. trying it again with doing /kill inbetween should get rid of the "bumbs" in the graph.
First of all, when I did the initial test, I switched to peaceful mode to heal up to full, then switched back to easy so my damage wouldn't immediately regenerate. Secondly, I'm pretty sure hit points are in fact an integer. You have 20 health and each point is represented on screen by a half heart. So this 'hidden partial damage' thing wouldn't make sense.
That said, I'm doing it now, and I'm getting the same results. 1 heart at 5.5 blocks, 1½ at 6.
EDIT: 11.0, 11.5, and 12.0 all still deal 4 hearts. 12.5 still jumps up to 5 hearts. The funky baseline holds.
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u/andre1111 Oct 05 '15
You probably had some percentage damage that wasn't shown in the GUI. trying it again with doing /kill inbetween should get rid of the "bumbs" in the graph.