Why do i get different result when sorting with one random seed?

I am using elasticsearch 1.3.2 in production with a node of 2 masters with data.

I have a realy strange behavior when i search with a fixed random seed on this cluster. I get exactly 2 different sortings of my results. It seems that every node holds its one random "seed" and depending which node delivers the result the sorting is different.

I want to get same sortings with the same seed.

How can i fix this issue?