Two Ways to Ensure the WordPress “Read More” Button Links to the Top of Your Post http://oncecoupled.com/2016/09/wordpress-read-more-top-of-post/

functions.php

<?php // Don't paste this opening line!

function remove_more_link_scroll( $link ) {
	$link = preg_replace( '|#more-[0-9]+|', '', $link );
	return $link;
}
add_filter( 'the_content_more_link', 'remove_more_link_scroll' );