Trees not lighting properly

I have some trees in my scene on a terrain, and its set in night so its dark and the player has a torch (which is just a spotlight), theres this weird thing where the trees light up when they are close to the torch even though they arent in the light. and when the players moves away from the tree, the colour suddenly changes dark again.

in the picture there are 2 trees in the middle, one of them is close enough to light up and the other one has gone completely dark, the one thats lit up is the exact same tree object. (Ive lit up the scene a bit to make it more clear) Ive been trying to fix it but it doesnt fix.