I can't connect in servers. Only The Hive and Mineplex are working

I can't connect in servers. Only The Hive and Mineplex are working. But CubeCraft, Mineville and LifeBoat aren't working.
What I expected to happen was servers working normally.

What actually happened was that I clicked on all the servers and only The Hive and Mineplex worked. The others like Cubecraft, Mineville and Lifeboat didn't work. I've waited for a long time, but I couldn't enter the server.

Steps to reproduce:
1. Press play
2. Go to "Servers" menu
3. Just press any server (except The Hive and Mineplex)
4. Wait a long time (You'll see that doesn't matter what you do, it doesn't work)