Issue adding rows to a chart in Numbers
I have a chart, accessing data from 3 columns in a table in Numbers. It has around 160 rows now and rows are added regularly. Up to now, I have been able to Edit Data References successfully, clicking on the chart and dragging the coloured columns down to cover the new rows. Suddenly, the dragging has become unstable with columns no longer acting in unison, breaking loose from the anchor at the top row or opening gaps to miss random rows.
Any thoughts on why this is happening when it has not happened on this chart previously?
iMac 21.5″, macOS 11.6