How to remove #more… from the post “More” link?

There you go this will prevent scroll (add to functions.php)

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' );

Explained in depth Here.