Could you please share the JSON export file of your field group so I can test it out on my installation? Also, could you please check your error log on your server? The error log usually shows more detailed information about the issue.
Have you tried to reproduce the issue on one of the WordPress’ stock themes (like Twenty Fifteen) with only ACF activated? Sometimes, WordPress plugins and themes are not coded correctly, and it can cause a conflict between each other. By deactivating them, we will know right away if there’s a conflict on your site or not. If we know which one caused the issue, we can focus on that theme/plugin alone to solve it.
It’s possible that you have the
max_vars variable issue. Could you please try the solution on this page: https://www.advancedcustomfields.com/resources/limit-number-fields/?
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