We're sorry you're having issues with displaying the tick labels inside the chart. It looks as though there is a bug in our axis width calculation code, meaning it doesn't cater for negative tick gaps, so the chart's plot area ends up bigger than the chart itself, resulting in the behaviour you saw.
We've logged the bug, but we do not yet have an estimate on when it will be fixed. We'll update this post when a fix is released.
The good news is that you can work around the issue by manually setting the axis width to the width of the axis line, e.g.:
yAxis.width = 2
I hope that fixes the issue for now.