When viewing the page on a Japanese Mac, the letter sequence "am" within "Open source team chat" is incorrectly displayed as a single-character "A.M." symbol. I

When viewing the page on a Japanese Mac, the letter sequence "am" within "Open source team chat" is incorrectly displayed as a single-character "A.M." symbol. It appears the CSS is specifying "'dlig' 1" for the H tags - 'dlig' stands for Discretionary Ligatures, which triggers all sorts of weird inadvertent ligatures and should be used, as its name shows, with discretion. https://www.dropbox.com/s/1j6vywsfycm6r4m/dlig.png?dl=0 https://www.dropbox.com/s/1j6vywsfycm6r4m/dlig.png?dl=0