How much does Cloudflare changes the source code the user gets? - CDN issue?

I just tested a page in GTmetrix:

GTmetrix says to optimize this pic: https://yt3.ggpht.com/-LgGjQtGqURw/AAAAAAAAAAI/AAAAAAAAAAA/xN0Zl3clszA/s68-c-k-no-mo-rj-c0xffffff/photo.jpg

This pic doesn’t appear in the source code in the browser (there is no photo.jpg), or on the page, and it shouldn’t (maybe a year ago it did belong on that page).

To what extent does cloudflare change the source code the user gets? Why did GTmetrix see this image but it’s not in the source code?

Using wordpress (WPbakery + the7 theme).

Thank you :slight_smile:

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