I have inbuilt table of content in my theme but rank math is detecting it

Hello,

Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for any inconvenience this issue may have caused you.

Unfortunately, Rank Math only detects the Table of Content if it is added with the compatible plugins from our list.

However, you can add the following piece of code to your theme’s functions.php file to disable the TOC test from Rank Math:

/**
 * Filter to disable the table of contents test
 */
add_filter( 'rank_math/researches/tests', function( $tests, $type ) {
    unset(
        $tests['contentHasTOC'],
    );
    return $tests;
}, 10, 2 );

Please note that these tests are only there for your reference to help you in optimizing your pages/post content. If you feel any of them doesn’t apply to your page, please feel free to ignore them.

I hope that helps.

Thank you.