Why Gremlins Towers are random for a same game and same item?

[Nike-it]

Originally Posted by Vilk

I noticed sometimes the gremlin towers change for a same item. I just get 4 red instead of 2 red and 2 brown (as if it could not have been the reverse!) I wonder what trigger the change.

Is anybody has an idea? The character level? Army composition?

It is just part of gameplay, many game events are randomized, the same situation is with gremlin towers.