Greetings!
I have an area chart with one series.
I used to run Highcharts 7 but since upgrading to 10, the tooltip for all the points but the middle one stopped working. I imported as an experiment the example on Highcharts and only the highest point of the USSR/Russia point (as shown below) can be hovered.
When I hover around the chart, sometimes that point gets selected.
I can try to provide a fiddlejs but I am not sure if it would help since i just copied over the example into my app.
Just to mention, I'm also using highcharts-angular.