You have ACF included in another plugin, more than likely a plugin. It could be in the theme but what you describe seems like it’s in a plugin.
Look at your other plugins and figure out which one includes ACF. Deactivate and reactivate that other plugin. This might help because it will alter the order that plugins are loaded.
You also need to get an updated version of the plugin causing the issue or ask that plugin author about an update.
