inspection – Google says that an indexed page does not appear in the Sitemap, while it is in the Sitemap

Google's search console indicates that my website is "indexed but not submitted in the site map". However, I have submitted the URL in the site map. It's been so long.

I've tested for https://www.example.com/annapurna-base-camp-trekking which is in the sitemap but Google says that's not the case.

Is this the reason why my website is not at the top of the list?

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