I saw this happening because of the “500 Internal Server Error” shown in the attached screenshot.
This can be due to plugin conflict on your site so please try temporarily deactivating all plugins except the Ivory Search plugin and see whether everything works fine, and then enable the plugins one by one to see which plugin is conflicting if any.
Also, this can be a theme issue on your site, so to confirm it, just temporarily use the Twenty Twenty-Four theme on your site. If everything works fine, then it’s your site theme issue.
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