Looks like it's something to do with it being unlicensed. If you go here: https://befonts.com/integral-cf-font-family.html https://befonts.com/integral-cf-font

Looks like it's something to do with it being unlicensed. If you go here: https://befonts.com/integral-cf-font-family.html https://befonts.com/integral-cf-font-family.html And type "1234" into the "sample text" input, you'll see the 'bad 4' more clearly.