On this website that I'm managing, there is an inexplicable error that is effecting SERPs and rankings.
Specifically, this page
/botox-nyc/ is showing as indexed in GSC
However, when expanding the view the specific URL is not in the sitemap
When going to sitemaps - everything is showing as fully processed & active:
And the page is in the sitemap as below:
This has caused dramatic drop in rankings & it's not clear how to deal with this issue. Thank you in advance for helping!