I did not understand anything. have you ever tried another cache plugin before?
If I paste an article from my site as a permalink on another website, it should look like this: https://existenzielle-fuehrung.de/wp-content/uploads/2021/04/normaloutput.png.
If I have activated your plugin, then the characters are no longer displayed correctly: https://existenzielle-fuehrung.de/wp-content/uploads/2021/04/badoutput.png .
It seems that the charset is no longer interpreted correctly.
can you enable only the “Cache System” option and disable all the options and clear all cache with minified sources please?
I have done everything accordingly, but the problem remains. First everything appears correctly, after a few calls the characters are corrupt again.
it means that your site is not compatible with the cache plugins.