I follow multiple people. The following tab shows a couple of their posts and the rest is just random posters
Are you maybe seeing things that have been reposted by people you follow? There's a lot of that, but those still count as "posts from people you follow". If you want to exclude those, there are settings at the following link:
https://bsky.app/settings/following-feed
Also if you just want to not see them sometimes, there's a feed you can add called 'OnlyPosts':
And that only-posts feed is even stranger. It only shows 3 days. People I follow have months of posts.