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Thank you, it was appending every time the month value changed. I just looked up on the forum for similar glitches and found the solution here: ChartJs mouse hover bug (showing previous charts)
- Chartjs-Chart.js with Node.js
- Chartjs-ChartJS Grid Lines shouldn't surpass the X Axis (Y = 0) Line & Re-style Y Axis Color and Width
Source:stackexchange.com