rlaranjeira opened a new issue #14260:
URL: https://github.com/apache/echarts/issues/14260


   ### Version
   4.6.0
   also reproduced on 5.0.2
   
   ### Steps to reproduce
   
   1. First render chart with those options
   
   ```
   option = {
       animation: false,
       angleAxis: {
           type: 'category',
           data: ['S1', 'S2', 'S3', 'S4', 'S5', 'S6']
       },
       dataZoom: {
         type: "inside",
         filterMode: "none",
         radiusAxisIndex: 0,
         startValue: 0,
         endValue: 15
       },
       radiusAxis: {
           min: 0,
           max: 15
       },
       polar: {
       },
       series: [{
           type: 'line',
           data: [2, 2, 2, 2, 2, 2, 2],
           coordinateSystem: 'polar',
           name: 'A',
           itemStyle: {
               color: "blue"
           }
       },
       {
           type: 'line',
           data: [4, 4, 4, 4, 4, 4, 4],
           coordinateSystem: 'polar',
           name: 'B',
           itemStyle: {
               color: "red"
           }
       },
       {
           type: 'line',
           data: [6, 6, 6, 6, 6, 6, 6],
           coordinateSystem: 'polar',
           name: 'C',
           itemStyle: {
               color: "green"
           }
       }],
       legend: {
           show: true,
           data: ['A', 'B', 'C']
       }
   };
   ```
   
   2. Now update dataZoom startValue to 8
   
   ### What is expected ?
   Lines should not be reversed, but cropped.
   
   
   ### What is actually happening ?
   Lines are actually rendering in inverse order, blue curve get bigger than 
red and green curve.
   
![strange-dataZoom-polar](https://user-images.githubusercontent.com/20238705/107650791-2017a900-6c7f-11eb-8e56-a616f18b1f74.gif)


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