I can confirm the issue in your site.
Can you please Contact your host to increase your allocated memory or do it yourself by adding this code in your wp-config.php .
define( 'WP_MEMORY_LIMIT', '256M' );
define( 'WP_MAX_MEMORY_LIMIT', '512M' );
If you could please try the above and if you still have the issue we'd be more than happy to assist.