In the modeller, when I select LOD3, the total number of output tris and points is different from the actual number of tris or points. You can see it in the screenshots where I select all tris and points. I think it should say 26 tris / 20 pts, but it says 36 tris / 46 pts. I don't know how those numbers are calculated.
You seem to be creating triangles manually for the edge of the tree - instead you could use the extrude function and it would create the triangles automatically.