inspection: Google says that an indexed page is not found on the site map, although it is on the site map

The Google search console shows that my website is "indexed but not sent on the site map". However, I have sent the URL on the site map. It has been so long.

I have tried to https://www.example.com/annapurna-base-camp-trekking which is on the site map, but Google says no.

Is the reason why my website is not in the top list?

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