I have already replied to the support ticket that was opened by you on the same matter, so I paste my answer below:
Each item from a category series is associated by the corresponding x-axis item. It may be possible that you have created multiple series with only one item instead of one series with multiple items. See how a bar series is declared here. Note that the same properties set in the markup can also be used for the programmatic creation of the chart as well.
Regarding templates in tooltips and lables I can suggest that you go through this demo and this help article in order to see how to declare them.
As for stacking and stacking in groups you can refer to this and this online demos.
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