It sounds like there is an issue with the sitemap URLs in your Odoo application, specifically that they are showing HTTP URLs instead of HTTPS URLs.

Here are a few things you can check to troubleshoot the issue:

1. Verify that your website is properly configured to use HTTPS by checking the settings in your web server or reverse proxy. Make sure that all requests are being redirected from HTTP to HTTPS.

2. Check the settings in your Odoo application to ensure that the URL used for the sitemap is set to use HTTPS. This can typically be found in the website settings or under the "Settings" menu in the Odoo backend.

3. Check the settings of your website, in the 'Website' module, in the 'Configuration' tab, make sure that the 'Website URL' is set to https.

4. Check the XML file of your website, specifically the URLs of the sitemap. Make sure that the URLs are set to HTTPS, and not HTTP.

5. Make sure that the SSL certificate is correctly installed and configured.

6. Try to re-generate the sitemap and check if the URLs are now https

7. Check if there is any third party module that is changing the URLs to http, if so, try to deactivate it.