Consider the distributions I have plotted below. They are of the same variables, one in normal histogram form and another in kernel density (Epachanov).
As far as I know, the auc of the kernel curves is 1, so I'm not sure why the y-axis would need to change sometimes for that. Yeah, the main thing is I'm not sure why sometimes the y axis is the same and sometimes the y axis is different.
Why did the y axis remain the same for the left two (0 to .8) but changed for the right two (histogram is 0 to 14, kernel is 1 to 7)? Feel free to explain about how the y axis factors into interpretation if you don't mind.