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This seems to be caused by case-sensitivity of colour names.
Change your colours to all lowercase like so:
backgroundColor: ['#ff7f27', 'dodgerblue', 'green'],
borderColor: ['#ff7f27', 'dodgerblue', 'green'],
The CSS3 specification explicitly states the names are case-insensitive so this looks like a bug in Chart.js
Source:stackexchange.com