I work on a system who always bug with the google font load, but i can\'t see when the font is not loaded because I have all these font in local (for Photoshop) so the font look
On Chrome/Brave you can now see where the font was loaded from. Go to view —> developer –> inspect elements –> make sure the elements tab is selected –> select the computed sub-tab –> scroll to the bottom and look for rendered fonts. If it's a local file it'll say YOUR_FONT – local file.
If using a Mac, then you can disable the local font in the Font Book application. Just open that app, then find the font you want to disable, right click, and select Disable "YOUR_FONT" Family. Then refresh the page and you should see what the user without that font will see.