Fix for shared capacity tickets available being wrong after deleting attendee

example.php

<?php

// Replace this value with the event id
$my_event_id = 123;

// Replace this value with the correct number of capacity 
// that should be displaying for shared capacity tickets.
$correct_remaining_tickets = 9;

add_action( 'init', function() {
	update_post_meta( $my_event_id,  '_tribe_ticket_global_stock_level', $correct_remaining_tickets );
});