My site was changed. It is way better than before in terms of SEO, content, speed, responsiveness, basically everything. The new meta title and descriptions are better, more logical, up to date and corresponding with the content.

After publishing the site, I did everything that should be done, sent sitemaps to Search Console, and requested indexing for this page. After a day or two, the site was displaying just fine, with the new meta title and descriptions.

Another day or two passed and I am seeing the ugly old meta title/description again, with pointless data...

However, it looks fine when i type "site:mysite.com"

What is the best approach for this? I've actually experienced this a few times before.