Some problem using Heatmap

[#1]

With attached Wafer Stacked Samll.jmp file, I plan to show the heatmap of wafer defect with following step, but Heatmap can't show properly .

1. Showing the scatter plot, it's ok

2. but when I show the Heatmap, it looks worng. It doesn't show heatmap for each die location.

[#2]

There isn't one that I know about. As far as axis settings go, the only modifier I know about with the Magnifier is option-clicking to return to your initial zoom and settings after zooming. A modifier to retain your axis settings while zooming would be a good item for the wish list. 

[#3]

wish ... here it is:
Heatmap - option: fixed Tick spacing (aggregation area)