mixed content error

hi there, beforehand installed SSL Insecure Content Fixer, as soon as i install it, it did not fix the errors of:

Mixed Content: The page at ‘https://thepassiontest.com/’ was loaded over HTTPS, but requested an insecure font ‘https://themes.googleusercontent.com/static/fonts/inconsolata/v5/BjAYBlHtW3CJxDcjzrnZCIbN6UDyHWBl620a-IRfuBk.woff’. This request has been blocked; the content must be served over HTTPS.

after 3 days either SSL Insecure Content Fixer or WordPress HTTPS or WP Force SSL they make it well, the errors were gone.

Now, via FTP (File Zilla) i removed the pictures and upload them again, now the Mixed content errors come again, to be able to get rid of from one million Mixed content error, what should i do?

thank you very much