We aren’t seeing a sitemap generated at https://infofeed.ir/shilat/sitemap_index.xml and the sitemap you do have does not appear to be generated by the Yoast SEO plugin at https://infofeed.ir/shilat/sitemap.xml
Can you please confirm whether you are still using the Yoast SEO plugin?
If you have the plugin deactivated and are still planning on using it for generating the sitemap we suggest the following actions:
1. Clear all your caching from your theme, plugin, server, CDN like CloudFlare or browser. If you are not sure how to clear caching from theme/plugin please speak to those authors. If you want to clear cache from the server, please speak to your host provider. To clear the cache from a browser use this guide: https://kb.yoast.com/kb/how-to-clear-my-browsers-cache/.
2. Delete your sitemap in Google. Doing so will not hurt the SEO of the site. This guide explains more (scroll to the bottom): https://support.google.com/webmasters/answer/183669?hl=en.
3. Submit the sitemap again. Be sure to submit only sitemap_index.xml and nothing else. This guide explains more: https://kb.yoast.com/kb/submit-sitemap-search-engines/.
4. Edit your robots.txt to remove your sitemaps. This guide explains more: https://kb.yoast.com/kb/how-to-edit-robots-txt-through-yoast-seo/
