Could you please try temporarily deactivating all third-party plugins on your site, while keeping the necessary theme-related ones active? If the issue is resolved, gradually reactivate the plugins one by one to identify the one causing the problem. Additionally, consider switching to the parent theme if you’re currently using a child theme.
If the issue persists despite these steps, please ensure you have a complete backup of your site. With your permission, we’ll thoroughly debug your site by deactivating all third-party plugins and reverting any on-site customization changes. This will allow us to investigate the issue thoroughly and provide appropriate assistance and for that please share your site WP Admin URL and Credentials under the private area of this topic.