can you be more precise on what you mean with this picture? like is it 3/4 joining? or a full loading screen? the background picture ?
Hes asking what causes Chaos gates to open i think.
Are you talking about the “Waiting for members to load 3/4” at the bottom right? If so, one of the party members is taking a while to load in.
Oops, I thought I uploaded a different picture. Meant to upload one highlighting the bottom right that says 3/4.
its means that only 3 people fully loaded the chaosgate so you have to wait till everyone is rdy 
sometimes it takes longer sometimes its instant
It is the amount of people in your group that are already loaded completly
So 3 out of 4 people are ready, 1 is still loading up
I think the point of this was that it takes too long in some cases (as if it’s stuck).
I managed to google the phrase, look for some time and post this reply and it still hasn’t loaded.