Nationbeingthing mysteries

The Meeting

After a long drive that seemed even longer with Croatia and Serbia's spats, the 4 finally arrive at Strasbourg, the city which hosts the Council of Europe. As they approach the buildings, they see that quite a few nations have already arrived. They park and as soon as exiting the car they are greeted by Slovenia:

Slovenia: Pozdrav friends!
Srb,Hrv,Mne,Bih (seemingly upset): Hi.
Slovenia: Why are you all acting like this? I didn't want the 6 of us riding in a single car so I went with Italy.

Italy is waving in the distance.

Slovenia: Where is North Macedonia?
Montenegro: Oh he's having another existential crisis. He'll be fine.
Slovenia: If you say so.

Serbia notices that Russia is infront of the building entrance but decides not to approach her. He doesn't want to bother her.

As the time of the meeting draws nearer, all the nations take their seats in the big round hall. France as the host decided to let everybody have a word. Romania interrupts the arguement between Austria and Italy asking to use the restroom.
After the arguement between Austria and Italy, France announces a 2h recess.

Serbia went to the restroom. Russia and he returned to the meeting together.

Lithuania stormed down the hallway, freaking out, and bumped into Poland, Belarus and Romania.

Hungary was outside, kicking a wall. He was obviously upset.

What could have caused all this havoc?