Question Wrong user group image

I added some special images for certaing groups, set as "special".

Something is wrong on visualization: Look at the picture, the user albetheboss is actually a staff member, jahrastafari isn't. But jahrastafari has the staff image on his first post in the topic, and the user normal image on the other.

If I understand your problem correctly, I suspect the "groups" you mention are, instead, to user ranks. If you look at Ranks Management in the Wiki there's a very detailed explanation of how to setup your user ranks.

For the "special" categories, although some ranks are automatically assigned by Kunena (e.g. admins and moderators) you will need to individually assign ranks to other types of users.