Highcharts not showing value when two stacked columns have value = 1

Question

I'm trying to show numbers in my Highcharts stacked columns. I have this issue that can be seen in my left column. When there are two small numbers together only one is shown.

This issue didn't happen with big numbers.

I've tried this so far:

• yAxis logarithmic and min: 0:

       yAxis: {
       min: 0,
       AxisTypeValue:'logarithmic',
       title: {
           text: 'Texto Cantidad'
       },
       stackLabels: {
           enabled: false,
           style: {
               fontWeight: 'bold',
               color: ( // theme
                   Highcharts.defaultOptions.title.style &&
                   Highcharts.defaultOptions.title.style.color
               ) || 'gray'
           }
       }
   },
  

• This is my PlotOptions

       plotOptions: {
       column: {
           grouping: false,
           stacking: 'normal',
           dataLabels: {
               enabled: true,
               formatter: function(){
                   var val = this.y;
                   if (val < 1) {
                       return '';
                   }
                   return val;
               }
           }
       }    
   },
  

Answer 1

The issue is caused by default anti-overlap behaviour for data labels. To display both data labels enable the allowOverlap option.

    plotOptions: {
        column: {
            ...,
            dataLabels: {
                allowOverlap: true,
                ...
            }
        }
    }

---

Live demo: http://jsfiddle.net/BlackLabel/k4vojwea/

API Reference: https://api.highcharts.com/highcharts/series.column.dataLabels.allowOverlap