The Spanish mobile version of my site dropped just in the US

[guarriman3]

One of the my websites lists information in Spanish, about hotels in Mexico, focused mainly on the Mexican people living in the US.

According to Google Search Console, on January 22 the 'Averate Position' of the mobile pages started to drop just in the US (from 9 to 16), while it remains unchanged in Mexico (around 7)

I wondered if someone of you had any similar experience, and about which parameters I should analyze to find the origin of this drop.

[not2easy]

If only the mobile version is affected, you might look at the CWV to check whether there has been a change in your numbers there.

[guarriman3]

Thank you, @not2easy.

Yep, there is an issue in the Core Web Vitals (just Mobile) that started in March 12 and I did not notice. I will try to fix it.

Why the 'Average Position' was just eroded in the US-mobile and not in Mexico-mobile?

[not2easy]

Google has been making a good number or irrational changes recently but I could not guess about their reasoning. (blame AI?) You can check back in a week or more and it may revert to where it was, but it is anyone's guess. Maybe if you were checking from Mexico you might find different positions.

[guarriman3]

Or Google may be considering that US users prefer other websites where the Average Time on Page is higher, and Google ranks them better just in US.

Or even Google may biasing against websites from outside US (as mine) and more in favor of US localisation, according to this thread:
[webmasterworld.com...]
(my website is not a company, just a website with a '.com' TLD that lists useful information and displays Adsense ads)