Custom font not working on mobile, Squarespace 7.1

For some reason, our custom type, GT America Bold, reads normally when we test it on Squarespace's "mobile" setting on a desktop browser (chrome), but on our actual mobile devices, the GT America Bold is being replaced with some other random typeface that also contains some weird artifacts (it looks like it's being duplicated or tripled in its appearance, in some cases). Anyone have a solution here? Entering our site information and code below, for reference. 

Thank you! 

SITE: https://www.alliswellstudios.com/about

CODE: 

@font-face {
    font-family: 'GTAmericaBold';
       src: url('https://static1.squarespace.com/static/640254492f4ddd03f446b1a3/t/6423560b2409b21c0435b6a4/1680037387766/GT-America-Standard-Bold.otf');}

h1 {font-family: 'GTAmericaBold';}
h2 {font-family: 'GTAmericaBold';}
h3 {font-family: 'GTAmericaBold';}
h4 {font-family: 'GTAmericaBold';}

The url doesn't work. Can you check it again?

oops! sorry we changed that navigation item.  @tuanphanthe site is alliswellstudios.com

We turned the custom font off so we could make the site live, but the issue persists. Any idea what's going on? Code was: 

@font-face {
    font-family: 'GTAmericaBold';
       src: url('https://static1.squarespace.com/static/640254492f4ddd03f446b1a3/t/6423560b2409b21c0435b6a4/1680037387766/GT-America-Standard-Bold.otf');}

h1 {font-family: 'GTAmericaBold';}
h2 {font-family: 'GTAmericaBold';}
h3 {font-family: 'GTAmericaBold';}
h4 {font-family: 'GTAmericaBold';}

On 4/6/2023 at 4:35 AM, AIW said:

oops! sorry we changed that navigation item.  @tuanphanthe site is alliswellstudios.com

We turned the custom font off so we could make the site live, but the issue persists. Any idea what's going on? Code was: 

@font-face {
    font-family: 'GTAmericaBold';
       src: url('https://static1.squarespace.com/static/640254492f4ddd03f446b1a3/t/6423560b2409b21c0435b6a4/1680037387766/GT-America-Standard-Bold.otf');}

h1 {font-family: 'GTAmericaBold';}
h2 {font-family: 'GTAmericaBold';}
h3 {font-family: 'GTAmericaBold';}
h4 {font-family: 'GTAmericaBold';}

Can you add & keep the code?