WOW!
I have just found a solution and it works! 
I removed function spawn zle (and spawn dobre) from contruction script leaving only set extension box there and put these functions in event graph connecting with event of play beginning.
My game works, everytime I play it spawns items in diffrent ways
I am so happy, and thank you for help, your idea of spawning was much better and much more random than mine 
Great 
Sorry, didn’t catch that you were using the construction script
I use Unreal Engine a few days only, three or four and I am a complete beginner (I once made a simple game in Blender game engine) so there are some basic things I still do not know and miss during making my games.
Anyway I am quite proud that I finished it and understand how it works, nice beginning
Thanks for help again