Are you sure you double click random? If you just click random once and enter then it wob't randomize, you have to double click randomize and then the window will go away.
Also, another reason to have a neutral party do the randomizations. I'm strictly against giving favorizations to lower seeds though, we don't do it for carc and asc and no sports tournament does it, ever. Seed based on win/loss percentage, then go from there. Randomization is way easier than pick and choose, if there's mirrors so be it/the organizer can rerandomize.
Yeah, if you don't double click nothing happens. So, I sort of have to be double clicking. Seems like there is a massive bias to the faction you last picked manually.
I finally said fuck it and picked the dwarves. 25 games in and never a single dwarf random.