Terrain wrong collision with FPC

Physics
1

I don’t know what I have pressed, the collision with my FPC is at wrong places. I can pass through some mountains.

Also I tryed a new FPC and it pass through the terrain.

2

I don’t have a solution for this, except to say that sometime after the 2.5 update, the stock FPS character controller started falling through my terrain and I can’t use it anymore to preview the terrain (we don’t use the FPC controller in our game).

Something changed!

3

I probably resized the terrain?