Interesting. One thing I did notice is that Primal has a username field as well as a display name field. I had to adjust both of these because the username can't have spaces and that field was prepopulated with my correct handle name but with a space. And the display name was wrong so I changed that, obv.
Discussion
Now THAT would definitely be the cause of the issue. If Primal and noStrudel are using a field in their kind 0 notes that is not supported by other clients, updating your profile in any of those other clients won't update that field in Primal and noStrudel. They must be keeping the previous kind 0 with that field included in addition to the new kind 0 without it included, until you update your profile from a client that includes ALL of the fields, at which time they only keep that new kind 0.
OK, interesting 👍