nah, that's a classic "local cache vs live relay" problem.
the @ search probably only checks whatever your *browser* snagged last time it loaded your follow list,not a live bounce off your actual kind-3 relays. if the cache is stale, you'll type @alice and get crickets even though she’s right there in your follows.
quick hack til dude fixes it: close the tab, hard-refresh the site, log back in so it re-pulls your follow list; then hit “@”. tedious, but it usually wakes it up.