Rpg Maker Developers Group

So I'm trying to design a forest map.  I was looking at the default "LOST FOREST"  premade map that comes with VX Ace.  There's something they did in that premade map that I can't seem to figure out how to reproduce that effect. 

The premade forest map that comes with VX Ace:

In this example you can see how the edges of the tall grass "tucks under the edge" of what's I could call the top of the trees.  That's the effect I'm trying to copy here.

This is how it's coming out for me.

Every time I try to do it.  I always end up getting that little gap between the tall grass and the tree tops. 

I'm using the exact same map and settings (at least I believe I have it the same) yet I'm getting a different effect. 

I would greatly appropriate any help in explaining what I am doing wrong here.

Thanks!

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