I turned the bottom marker hidden using the following CSS

#container .highcharts-markers.highcharts-tracker.highcharts-series-hover path:nth-child(2) {

If you want to hide the top marker, use nth-child(1)

I did have to turn off the halo effect to make this work, since the halo is done with one path for both markers. To turn off the halo use:

    plotOptions: {
      series: {
          states: {
              hover: {
                  halo: false

If you leave the halo on, it will be the first path in the .highcharts-series-hover <g>, so you'll have to adjust your nth-child.

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