Yoast-schema-graph showing mixed URLs for the default language.
Solution:
The issue is escalated to our developers and will be fixed in a future version of WPML SEO. Meanwhile, please apply the suggested workaround to resolve the issue on your site.
1. Edit the functions.php file of your theme with a code editor or in Appearance -> Theme Editor.
3. Make a small change on the default language page and press the Update button. And also update the translations of the pages.
**** Important! Please make a full site backup (files and DB) before you proceed with those steps****