Custom font doesn't work in h1 for Products

Hi, I've put this code tu use an external font and it's working fine but not in H1's single product page.

What can I do?

Thanks!

PD: I attach a screenshot to indicate the font I want to change

-----

@font-face {
    font-family: 'Windsor';
    src: url('https://static1.squarespace.com/static/6461e882d28f3c73af141e8d/t/6461ffc0b409d5032eacc837/1684144065109/WindsorDUltHea.otf');
}

h1, h2, h3, h4, h5, h6, {
  font-family: 'Windsor';
}

Hi,

Can you share link to a product? We can check easier

Yes, here it is: https://contrabass-pineapple-433y.squarespace.com/botiga/p/ram-silvestre

Password: molsa2023

its works, thanks!!