How to set the particle seed?

I have a cloud particle system. I want to put it in my map, but I want it to have always the same shape. So, in all modules of the particle with random values, I used the “seed” version, as you can see here:

(I don’t know if I must mark the “Get Seed from Instance”, I didn’t understand the documentation about this checkbox… but it doesn’t matter, it didn’t work anyway)
(all the “Seed” modules contain the same “Seed” parameter)

But here are two instances, with the same seed (10), looking completely different from each other:

Here some screenshot with one of the instance’s settings:

122156-2instanceparams.png

What’s going on? I also tried to set the parameter on a blueprint, but it didn’t work also…

Since I didn’t had any answers, I also asked in the forums and I got the solution. If you have the same issues I had, please go to this thread: [Cascade]How to set the particle seed? - FX - Epic Developer Community Forums