Pattern grid when doing wavelet

[RicardoViana]

[ATTACHMENT NOT FOUND]Hi all.
Did any of you experienced grid like pattern when uprezing via wavelet?
In the default sim everything looks great. But when i sim with wavelet
i get these patterns in the render.
I'm emiting from realflow generated particles and loading them via PRTLoader.
rendering with Vray.

image in attach.

Thanks Ric