Hello Marcin,
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Thanks for getting in touch with us.
1. Please delete the sitemaps from the Google Search Console.
2. Clear your website cache and add sitemap_index.xml and *-sitemap.xml (this might be different for W3 Total Cache plugin) to the exclusion list in your Cache plugin.
3. Add sitemap_index.xml file again to your Google Search Console.
That should do the trick.
Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.
