The Javascript version (HTML5) has a problem with stacked bar graphs (I use StackedColumn3DLineDY) when the 1st value in the dataset is empty ('').
I use this to get empty columns instead of 0-s which works fine in the Flash version.
See: http://demo.dialxs.eu/graph.php
If you enter a '0' as the first value of series B it will work fine:
http://demo.dialxs.eu/graph.php?fix=0