Some URLs are Not showing in Sitemap

Hey BHW Family
In my sitemap nearly 100+ URLs are not showing but when i check them in Google using Site: tag they will appear in search results and even some traffic is also coming from these URLs.
How can i solve this error, even these are URLs are showing as can canonical tag error ( Alternate page with proper canonical tag) Even i am using canonical tag properly.

maybe your sitemap creating plugin is bugged. But why would you care about this anyway? As long as the links are indexed and ranking the ultimate goal of a sitemap has been achieved

Which Sitemap plugin you are using