Yeah that’s definitely a caching issue. The code you have there should handle it but you can’t really guarantee anything.
Do you have a caching plugin installed? If so try disabling that.
Also in your wp-config.php file see if you have this define('WP_CACHE', true); if so change it to false. If it isn’t there add it but make that false.
That’s really all, in my experience, you can do from our end unfortunately.
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