CF6 - {user:name} Not showing name anymore

Hi. A couple of months ago I created a form to pick the logged in users name (full name) to show up in the form. Then it was working fine. This is a wordpress site that I havent been working on for some weeks, but when I tried the form the other day it doesn't show the full name anymore. Se pictures below.
I use this shortcode {user:name} and have also tried "id" & "username" with no luck...
Any suggestions ?

Here are som screenshots from PhpMyAdmin of the WP user db and the CF form db.
Earlier the form would get the full name "John Doe" and not only "johnd"...
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What do you get if you just do {user:} ? Should show a list of all the data available

Tanks for your reply !
I get this :
{"id":"26","name":"johnd","username":"JohnD","email":"john@doe.com","last_login":"","logged_in":1,"guest":0,"groups":["subscriber"],"inheritance":[],"guest_id":"26"}