If your run is from 1.0 to 1.2 just choose Story Bosses.

So you may be wondering whats the difference between Story Bosses and All Bosses, I'll explain it here, with the update 1.3 came a new boss, and this change to BossRush% is meant to keep the same old BossRush% still around while having a new BossRush% here as well.

If you are trying to do a run in the All Bosses subcategory please choose every single boss in playlist, if your trying to do a Story Bosses run choose every bossfight from the Storymode version of the game and don't choose any added from 1.3 and onwards. If you have any questions be sure to post them here, I'll try and reply back to them.