Number of groups
For the normal second stage of the tournament count of groups must be a number which equals to 2 powered by some natural number. Also difference between each group number of participants must be not more then one, because it often happens that one of the groups is only 1 or 2 participants, and that is the problem.
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David commented
I agree with the first statement in this description, but I wouldn’t want to prevent having non-power of 2 groups. I think it would be better to have a number of groups option, so 4, 8, etc. groups could be chosen, then, as in this feature request, Challonge should divide players among the groups as evenly as possible. No group should have more than one more player than any group.