@FleurHitchcock@racheldelahaye No witchcraft, I'm afraid - it displays that way because you're both on the SAME server. Masto only adds the server name if it's different. A bit like area codes on a landline, back when we had landlines.
@FleurHitchcock@racheldelahaye because you're both on the mstdn.socal server, so no need to refer to the whole address. I guess that's like 01225 not being needed to call my in-laws.