Despite proper hreflang and lang attribute implementation using xml sitemaps, I'm seeing sitelinks from different countries. Any help please?

[eset]

When someone searches for our brand in US, instead of only US links, users are served with canadian or iranian sitelinks. Despite we have properly implemented xml sitemaps with hreflangs, even we have implemented lang attribute in the head section of source code for every country. I'd be thankful for any advice.