Defender HTTP Header Tweaks Not Working

When I try to set up the HTTP Security Headers options it gives a success message, but upon reloading the page they all say they’re tweaks I haven’t done. What could cause this?

I’m using Akismet, Branda, Smush, Forminator, Instant Images, Social Warfare, and Site Kit plugins, my theme is Extra, and all of my core, themes, and plugins are on the latest version.

Thanks for your help.