I’ve just tested it on my installation and found out that you are using a multisite installation. Could you please try to reproduce the issue on a single site instead? This will make sure that the issue is not the multisite setup.
Also, could you please try the code for the “promo” field 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.
Could you also let me know the total row of the data? Could you please try it with a page that has only one row?
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