It seems there’s a conflict on your site. Could you please try to reproduce the issue on one of the WordPress’ stock themes (like Twenty Sixteen) with only ACF activated? If it disappears, then you can activate the theme and plugins one by one to see which one causes the issue.
Also, could you please set WP_DEBUG to true to see any error messages on the page? Please take a look at this page to learn how to set it: https://codex.wordpress.org/Debugging_in_WordPress.
If there’s no error message on the page, could you please check the PHP error log on your server? It usually has more information regarding the issue.
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