Grouping function issue

Hello there,

I'm having grouping issue, it says i'm already in group:
-nobody is shown in party except myself
-the icon of dungeaon finder isn't shown
-the icon of my role in dungeon is still there
-the function of "leave party" does not appear when I right click my avatar
-can't invite or be invited by other people

I tried to deconnect and reconnect but the situation remains the same. I also submitted a ticket an hour ago but I didn't have any reply.

Thanks in advance for any help provided.

/script LeaveParty()