koobas.hobune.stream
Cant add more grass on terrain
The issue I am facing is when I try to paint more grass it gets rid of existing grass. This is before I paint over at the circled region... 
and this is after. 
As you can see, there is grass over where I wanted to paint but now there is a big gap. How would I fix this.
This question is over 2 years old but I will give some answers for future seekers.
This can happen if the "Detail Resolution Per Batch" is too high. You can get more grass by lowering it. That worked for me. You might be able to try increasing the "Detail Resolution" of your terrain as well. Although I haven't tried that one.
