Why did Google cache & index a different domain than my own?

[CassG1234]

We own www.homemenorca.com, a real estate website based in Spain. Pages from this domain are not being indexed: https://www.google.com/search?q=site%3Awww.homemenorca.com&oq=site%3Awww.homemenorca.com&aqs=chrome..69i57j69i58j69i59l2.3504j0j7&sourceid=chrome&ie=UTF-8Please notice that the URLs are Home Menorca, but the titles are not Home Menorca, they are Fincas Mantolan, a completely different domain and company: http://www.fincasmantolan.com/. Furthermore, when we look at Google's cache of Home Menorca, we see a different website: http://webcache.googleusercontent.com/search?q=cache%3Awww.homemenorca.com%2Fen&oq=cache%3Awww.homemenorca.com%2Fen&aqs=chrome..69i57j69i58j69i59.1311j0j4&sourceid=chrome&ie=UTF-8We reviewed Google Search Console, Google Fetch, the canonical tags, the XML sitemap, and many more items. Google Search Console accepted our XML sitemap, but is only indexing 5-10% of the pages. Google is fetching and rendering the pages properly. However, we are not seeing the correct content being indexed in Google. We have seen issues with page loading times, loading content longer than 4 seconds, but are unsure why Google would be indexing a different domain.If you have suggestions or thoughts, we would very much appreciate it.Additional Language Issue:When a user searches "Home Menorca" from America or the UK with "English" selected in their browser as their default language, they are given a Spanish result. It seems to have accurate hreflang annotations within the head section on the HTML pages, but it is not working properly. Furthermore, Fincas Mantolan's search result is listed immediately below Home Menorca's Spanish result. We believe that if we fix the issue above, we will also fix the language issue. Please let us know any thoughts or recommendations that can help us. Thank you very much!

[katemorris]

I'm not sure if this is a time issue, it is sure weird! I do see some of the pages as your competitors. But not all. And a search for your brand name from the US produces the English page. So everything looks okay there.

How is indexation at this point? My apologies for responding so late.

Was your site down for maintenance at all in the last month or so?