Question

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.

Could you please share the actual URL so we can check as well?

Meanwhile, please try adding the following filter to see if that strips the /category/ from the breadcrumbs URL:

add_filter( 'rank_math/frontend/breadcrumb/items', function( $crumbs, $class ) {
	$get_post_category = get_the_category();

	if ($get_post_category) {
	  foreach($get_post_category as $category) {
		  $url = get_category_link( $category->term_id );$i=0;
		  while(count($crumbs) >= $i){
			  if($url == $crumbs[$i][1]){
				  $parsed_url = parse_url($url);
				  $crumbs[$i][1] =  str_replace('/category/', '/', $url);
			  }$i++;
		  }
	  }
	}
	return $crumbs;
}, 10, 2);

Here’s how you can add a filter/hook to your WordPress site:
https://rankmath.com/kb/wordpress-hooks-actions-filters/

Let us know how this goes.

Thank you.