I have a map that I fill with foliage: trees, bushes, grass, rocks, etc. After I fill my map with foliage, I switch to Paint tool in Landscape Mode and begin to paint a texture with layers, right now I only have two layers. When I paint, after almost every mouse button release I have one tree that I placed with the foliage tool disappear. Its not necessarily a tree every time, sometimes I had bushes disappear in the same manner, or rocks. I have no clue why is this happening and how to prevent this, could really use some help.
Edit: Oh, and if I check the foliage tab again, I can see that the number of placed trees always goes down after this, so they definately get deleted somehow.