Problem with Grass Tool

i try an example from the Open World Tools Tips.
With the Texture Sample as a mask , it looks wrong. Pic below.
When i use the CheckerPattern the grass is at the correct position.
In the grass tool, i set the Placement Jitter to 0.

i make some more testing, the problem has something to do with the number of components in the landscape mash. If i use a landscape with one component and 1 or 4sections, everything looks good.
If i use a landscape with more then one component, only the first component is ok.