The most likely cause is that the algolia_config.js file is out of date. This can happen if the theme isn’t configured within the Algolia app or if the configuration file is overwritten.
To confirm that the theme is configured within the app, check that it shows up in the list in the Search options tab.
If the theme doesn’t show up and if it already contains a algolia_config.js file, you can synchronize the themes by clicking on the Synchronize metafields button.
If the theme shows up in the list and the configuration is still not updated, you can force the plugin to push the latest version of this file to the theme. To do this, you can update any Algolia setting, then revert it. On any update, we push the latest version of algolia_config.js file to your theme.