There is definitely something odd going on. I don't post much, but the same has happened to me. Also some folk I follow only show up if they're boosted, and others never render the identifier or picture, I'm just left with a robot and raw npub. I'd guess it's relay related, but I don't understand al...

Did your relay settings get messed up?

Sometimes this happens because of #nostr client Try another client and check if your recent posts appear It also changes to new relays or the largest and assets.