Something calling a 404 font

I have something in the Zerif theme trying to load https://decisiondata.org/wp-content/themes/zerif-lite/fonts/fontawesome-webfont.woff-?v=4.6.3

I had previously been unable to find the problem, so I just added a 301 redirect to the correct file location at https://decisiondata.org/wp-content/themes/zerif-lite/fonts/fontawesome-webfont.woff?v=4.6.3 (There was an extra “-” before the ?v)

This no longer works because I’ve moved over to a secure site, so now I get the error:

Mixed Content: The page at ‘https://decisiondata.org/’ was loaded over HTTPS, but requested an insecure font ‘https://decisiondata.org/wp-content/themes/zerif-lite/fonts/fontawesome-webfont.woff-?v=4.6.3’. This request has been blocked; the content must be served over HTTPS.

Because browsers no longer even attempt to fetch the file they aren’t getting the redirect.

Somehow something is hard-coded to the HTTP version of my site?? I’ve looked through all the PHP, CSS, and JS files with no luck finding the reference, but I’m probably just missing something stupid. Any help would be greatly appreciated.