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When I'm logged in, site is fine..
Logged out, it's as you see in the image.
Deactivating the Speedycache plugin fixes it.
Or doing the "Clear all cache and the settings" option within Speedycache instantly fixes the problem for a while. Then it reoccurs.
Any suggestions on why this is happening? And whether I can fix it without just deleting the plugin?

Contact SpeedyCache support. Or switch to any of the well known caching plugins.
Looks like double compression issue. This shit is happening when your hosting have some kind of caching on their side and creates a conflict with a caching plugin. Try disabling all cache options and then turn them on one by one.
I am pretty sure it is a GZIP double compression issue, as we experienced that many times on some of the sites we have been working:
[https://www.fixrunner.com/enable-gzip-compression-wordpress/](https://www.fixrunner.com/enable-gzip-compression-wordpress/)
[https://www.wpbeginner.com/glossary/gzip-compression/](https://www.wpbeginner.com/glossary/gzip-compression/)
[https://www.wpbeginner.com/wp-tutorials/how-to-enable-gzip-compression-in-wordpress/](https://www.wpbeginner.com/wp-tutorials/how-to-enable-gzip-compression-in-wordpress/)
[https://themeisle.com/blog/speed-up-your-wordpress-more-quick-wins/](https://themeisle.com/blog/speed-up-your-wordpress-more-quick-wins/)
Same problem i am facing currently. How did you solve it.
Never heard of it. Why not use the commonly used cache plugins?
Try some settings, otherwise uninstall it and try a different one. There’s plenty caching solution out there.
litespeed cache is the better altenative
SpeedyGibberish.
Have the host enable Brotli.
That’s what happens when your browser tries to read binary or compressed files. i use litespeed cache, still had to contact support to fix a few issues but works now.