MadCap Flare and Google fonts

Recently we had a problem where despite our css calling Google fonts, our TOC was displaying Times New Roman in certain environments, such as on tablets. Inspecting the page in Chrome revealed that we had mixed content. The error read:

Mixed Content: The page at “our link” was loaded over HTTPS, but requested an insecure stylesheet ‘http://fonts.googleapis.com/’. This request has been blocked; the content must be served over HTTPS.

I checked out our css and our links were correctly pointing to the HTTPS link, so what could be wrong? In our case, we have a couple other stylesheets that are subordinate to our main css. I did a find and replace search in Flare (checking the source code box) for the unsecured, http link to Google fonts and found it. Changing it over to an https link fixed the problem.