Thanks for answering. Object rotation is disabled. I do not know what happened.
This is with yours plane (append in my file) everything looks great. (I exaggerate the deformation to see the problem better)

And this is with my new plane, they both have the same particle system but leaves and weeds seem to rotate …..

this is the .blend file, if you want to take a look: https://www.dropbox.com/s/ccjklh3eya97h9l/grass_Angel3.blend?dl=0
Thanks again!