Terrain and Light Problem:Only half of the radius of pointlight and spotlight touch/cast the terrain

*Please see the attached image, the image itself can explain my question.
I have two light, which is point light and spotlight. Both of them are set in important, has a soft shadow type, and Baking is set to realtime.

For this problem I tried to solve it using the knowledge I get from other forums. So here are the following things I tweak:
1. I changed the value of Pixel Light Count, I put it on "10" (still have the problem).
2. I tried to play with rendering path, forward rendering and deferred rendering (this isn't solve my problem).
3. I also increased the "Scale in Lightmap" to "128" (nothing happened).
4. Tried to play with Color Space, linear and gamma but I still have the problem.
5. I changed the baking from realtime to baked. This solved my problem. But the problem is, I need it to be realtime because my player is using flashlight.

here is the link for the image: https://drive.google.com/file/d/0B1vRoOkOP-y8bTJHOThkMnBiMTA/view?usp=sharing


I hope you can help me, thanks in advance!

 

in addition to my problem, here is the link to my video that shows the glitch of light: https://drive.google.com/file/d/0B1vRoOkOP-y8MTBMdnJTQ2hDekk/view?usp=sharing
0:00:00-0:00:26 > my setting to my spotlight and to the quality of the project
0:0026-0:00:58 > only half of the radius of the spotlight cast a light on the terrain. Moving the spotlight to X and Z axis, still have the problem.
0:00:58-0:01:12 > rotating a bit the spotlight in +Z axis the light is okay
0:01:12 -0:01:53 > rotating to -Z axis, no light on the terrain
0:01:53-0:02:05 > rotating to +X axis, the light is okay
0:02:05-0:02:16 > rotating to -X axis, no light on the terrain
0:02:16-0:02:37 > rotating a bit the spotlight on +Z axis and move the spotlight in both +Z and -Z axis, the light is okay.
0:02:37-0:02:43 > rotating a bit the spotlight on +X axis and move the spotlight in both +X and -X axis, the light is okay
0:02:43-0:03:11 > rotating a bit the spotlight on -Z axis and move the spotlight in both +Z and -Z axis, no light on the terrain.
0:03:11-0:03:35 > rotating a bit the spotlight on -X axis and move the spotlight in both +X and -X axis, no light on the terrain.