yaxis labels duplicated with a formatter function

[tmac12]

Description

When yaxis.labels.formatter is provided, in some case it duplicate values on yaxis. In my example, I receive y-axis data in seconds and need to display it on the chart in hours, so I use a formatter for this conversion. However, this results in some integer values being duplicated.

Steps to Reproduce

1. codepen link

   chart: {
   height: 380,
   width: "100%",
   type: "bar"
   },
   series: [
   {
     name: 'Incoming',
     data: [
       {
         x: '0-3200 rpm',
         y: 15417,
       },
       {
         x: '3200-6400 rpm',
         y: 1498,
       },
       {
         x: '6400-9600 rpm',
         y: 19038,
       },
       {
         x: '9600-12800 rpm',
         y: 19119,
       },
     ],
   }
   ],
   yaxis:{
   labels:{
     formatter: function(value){
       //console.log(value);
       var d = value;
       var dd = d / 3600;
       var rnd = Math.round(dd);
       return rnd.toString() + ' h';
     }
   }
   }
   }

Expected Behavior

The formatter show only unique values on yaxis.

Actual Behavior

On yaxis I see duplicated values only if formatter function is provided.

Screenshots

Reproduction Link

https://codepen.io/bortolazzoBreton/pen/qBwLajb

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