church courts

I've noticed that in many evangelical Presbyterian & Reformed denominations, there are three courts of the church, as opposed to the four outlined in Form of Presbyterial Church-Government, where it states: "It is lawful, and agreeable to the word of God, that there be a subordination of...

This might not be the right category to post in - feel free to move it. Some questions... Seeing recent-ish events such as the Romanist defect who was a PCA minister being allowed to preach his farewell sermon (and people protesting having their petitions rejected, or so I heard, at I think...