Tree creator leaves looks translucent

So, I was working with Tree Creator on Unity, and everything was working right, until I noticed that some trees leaves were translucent. First I thought that maybe it was something about the lighting, however, some other trees that I've created were looking fine.

Maybe it's hard to understand, until you see it, so I'll leave some screenshots here:

^ So, when you look from top the tree, it looks fine, nothing to worry about. *EDIT: this also happens when you look at it from a really, really short distance
^ As I mentioned before, other trees look totally fine

^ However, if I look at the tree from the ground (player's view), leaves looks translucent

Also, here are some specs of mine:

• I'm using mixed lighting (realtime and shadowmask).
• There's fog on the scene (Linear).
• Unity at some point asked me to "update" the shader of the materials when I selected them via editor for the tree.
• I'm using Unity 5.6.7 x64