Code not working on mobile

Site URL: https://www.bijouxcreative.com/content-creation

Hi guys,

I implemented the below code so that I could use two different font styles in the same block. The code works so that anything I mark as bold, changes to the desired style I've put in the code.

This works perfectly on desktop and mobile preview, however when checking the link on my phone, it doesn't seem to work (see screenshot attached).

Any ideas on how I can fix this?

- THE CODE -

b, strong {
   font-family: 'Brandon Grotesque', sans-serif;
   font-weight: 500;
   font-style: normal;
   font-size: 16px;
   letter-spacing: 0.04em;
   text-transform: normal;
   line-height: 1.4em;
}