Guys, help me out — my Snapchat looks and behaves differently than my friends'. Some people see new AR effects or different music in Spotlight, but I don't. Is this a glitch, or is something wrong with my phone?

It's not necessarily a problem with your phone — Snapchat does have different features depending on the region. I read a detailed article https://snapchatplanetsorders.com/why-snapchat-features-vary-by-region-and-what-developers-should-know-about-geo-restricted-social-platforms/ , which explains that Snapchat isn't "saying one thing and doing another" — it's the result of how the social platform adapts its features to regional laws, cultural preferences, and licensing restrictions.