Theme Font Issue

Hello,

I’m having an issue with the font settings area for the font Source Sans Pro. When I add CSS to adjust the font weight to bold, it it different on both safari and chrome.

You can check it out the issue at the link here: https://centerforaddictionstudies.com/faqs_jf-edit-2

I have also attached screenshots to show the difference in boldness, despite me adding the font-weight to bold. On chrome its coming up very faint.

Do you know what I can do to adjust this issue?

Best,
Tyler