No Codepen necessary since the problem is reproducible on a demo page as well:
https://apexcharts.com/javascript-chart-demos/line-charts/basic/

Forgot to say, thank you for maintaining this awesome library, it was a pleasure to work with so far!
Since we are using this at work, I will try to squeeze in some (company) time tomorrow and try to debug the issue, hopefully a pull request emerges out of it :crossed_fingers: