Web SDK doesn't publish my custom fonts

I’m using a custom font with 3 weights (450, 500 & 550). 

I’m using these in my paywalls, and they display properly in the Paywall Editor and in my iOS and Android app. 

On the web, (@revenuecat/purchases-js 1.39.1) it’s not as great. The 500 font doesn’t really show up different than the 450. Font-weight is good if I inspect it but visually it’s not right.

Wondering if it could be related to that specific font, or it’s a web SDK issue?

Thank you.