You use "Siteground-Optimizer" caching plugin
Remove the forum from this plugin
visit my wpForo > Tutrix.de (unofficial german wpForo Support)
with lots of customization & modification, e.g. hover cards, topic/post preview on mouseover, chatbox and much more...
Did (see 
) but the problem remains.
Where am I wrong?
do you want hide the Usergroup "Participant" in the member list
I do not see a Usergroup "Participant" in your member list
only Gruppo: "Registrato" and Gruppo: "Admministratore"
visit my wpForo > Tutrix.de (unofficial german wpForo Support)
with lots of customization & modification, e.g. hover cards, topic/post preview on mouseover, chatbox and much more...
SOLVED.
Authors were changed in Registered (I don't know why and when). When I turned them in authors again, they disappeared from the list.
