I’ve just updated a seven-year-old F1 site with new design in F6. New fonts, self-hosted on their own server, managed by Web Font Pro in Site Styles. TTF, Wolf and Woff2 , Regular, Bold and Cond. (I’ve done this for years and every detail is correct to save you time asking.)
It wasn’t until I had a Teams online meeting with them and they shared their browser screen that it was clear that the fallback sans-serif was showing. All one weight - no bold or cond. Probably Arial.
This is on Windows Safari and Firefox. All my testing on multiple browsers - Mac Studio, iPhone, iPad - show the fonts as intended.
Bizarrely, despite this they are very happy with their new site design - but I was straight back to check my settings and server permissions. All are OK.
I can’t see that their server is blocking the fonts loading as they sit inside their own url and fonts folder permissions are OK.
Any clues as to the cause?