Suddenly links appears underlined

I have a funny issue I never had had before:

All my link is underlined.

I know how to change it with CSS – but I can’t see why it suddenly appears.

In the html I can see it comes with generate-style-inline-css

<style id='generate-style-inline-css'>
body{background-color:var(--base-3);color:var(--contrast);}a{color:var(--accent);}a{text-decoration:underline;}.entry-title a, .site-branding a, a.button, .wp-block-button__link, .main-navigation a{text-decoration:none;}a:hover,……….. }
</style>

Is there a setting I have overlooked?