Chartjs-Strange issue with Chart.js bar chart, image scattering

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You might be interested by this post. You need to clear the canvas at the beginning of your makeGrafico function.

In a first time, you should try adding window.myBar.destroy(). If it does not work, you should consider deleting the canvas element and then creating it again :

var $parent = $('#canvas').parent();
$('#canvas').remove();
$parent.append('<canvas id="canvas"></canvas>');

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