What client are you using?
Discussion
I’m using damus
I figured so. Not sure what the deal is but I haven’t been able to @ them correctly for a while. I’ve seen this issue since before nostrdb. I’m assuming it’s Damus-specific since their profile loads correctly on other clients (e.g. Primal).
In order to mention them in the meantime (whenever I am on Damus), I’ll copy their npub and paste it right after the “@“. 🤙 
I’ll give that a try, thanks!