You can recreate this bug by setting the -fx-font-size to 13px, which is the default Mac OS font size. It is best to recreate this on the performance tab of HelloTableView. This results in the text in the columns becoming a slight bit longer, however the TableColumn header text remains at the previous size. This means that the measured width of the column header is less than the measured width of the column content, resulting in a misalignment of lines.