Google Fonts loading

Hello!

On this website (staging level) I only use the font ‘Montserrat’ on the entire website.

However, the Chrome Insepector still shows a connection to fonts.googleapis.com. (https://fonts.googleapis.com/css?family=Source+Sans+Pro)

It is strange that the font ‘Source Sans Pro’ is loaded via Google, although I do not use it on the entire website.

I have now downloaded the font "Source Sans 3' anyway in the Local Google Fonts extension (in Blocksy Companion Pro)

However, the Chrome Inspector still shows the connection to Google.
The source code you can see:
<style id='greenshift-post-css-inline-css'>
@import url(https://fonts.googleapis.com/css?family=Source+Sans+Pro)....

Do you have any hint how I can fix this? I have also tried the plugin 'Local Google Fonts'. The result is the same. It just finds the Montserrat, so I can host it local. But it doesn't find the other font.

I have also tried the Autoptimize plugin, where you can make a setting so that Google fonts are not loaded. Unfortunately, it didn't work either.

Thank you very much and best regards from Vienna!

Minsi

The page I need help with: [log in to see the link]