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Kirki problem with Google fonts
Kirki 5.0 has a problem loading Google fonts. Instead of loading the regular font weight it may appear in bold. Or look totally different because the Google font is not loaded at all.
1. Update to Kirki 5.1.0 https://wordpress.org/plugins/kirki/
2. Delete the transient kirki_remote_url_contents . Use this plugin https://wordpress.org/plugins/transients-manager/ to find and delete the transient.
3. Purge all your site caches (optimization plugin, CDN or Cloudflare, etc).
Google fonts should look fine again.