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I would say your tooltip is going off the edge of your canvas, have a look at this jsfiddle for an example. Or see sample code at the end.
Or, without seeing the full code, I might assume that your 2014 chart is overlapping the 2015 chart. Maybe fixed with a z-index in CSS, but then the opposite effect with the other chart may happen?
Same code from jsfiddle:
<div style='width: 300px;'>
<canvas id='chart'></canvas>
</div>
var ctx = document.getElementById('chart');
var chart = new Chart(ctx, {
type: 'pie',
data: {
labels: ["I am a really really really really really really really really really really really reallyreally really really really really really long label so long I might go off the chart"],
datasets: [{
data: [5],
}]
},
options: {
legend: {
display: false
},
maintainAspectRatio: false,
title: {
display: false,
fontSize: 16
}
}
});
Source:stackexchange.com