Sorry to hear about the problem you are having.
I have tested it on my test site and it’s working fine for me using the latest version of the plugin and PHP 8.2
It seems your website-specific issue.
This can be a theme issue used on your site so to confirm it just temporarily use the Twenty Twenty One theme on your site. If everything works fine then it’s your site theme issue.
Also, 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.
Best regards,
Ivory Search Support