I am noticing this issue on the UITableViews with default section header titles. Some of titles appear in the smaller font (as in iOS 10) while the other section header titles appear in a larger bolder font.
Only func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? has been implemented for showing the titles.
A workaround can be to use viewForHeaderInSectionwith a custom label, but I was wondering is there any other way to fix this.