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It's not just you — no one is posting on social media anymore
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
Profiles are rarely accurate. I viewed the same profile from two different instances (yes the same profile, not the same username from two different instances) and they didn't even have the age of thr account the same. One was 2 years, one was 2 months. So I wouldn't trust that. I'd only trust it if you're logged into that very instance.
In this case it's more likely to be because that's one of my alts. This is my main.