3 Spot lights - 2 of them work only in proper camera angle

Hello. I am learning unity and I managed to put 3 power lines(with lights) on my scene available from the asset store. They were build from the Unity team. I wanted to simulate a street where I have 3 spot lights simulating street lighting.

One of them works just fine and you can see that it is lighting from top. Other two lights don't light the area beneath as the first one. You can see there is a spot light but the intesnity is not as expected though they are duplicates of the first light. If I position the camera properly the other two lights might work with intensity as the first one.

Do I miss something about lights in unity?

I did some testing and it seems the two lights are mutualy exclusive. Once the circle of light gets below the terrain the other lights gets shut down.