I noticed something super odd while watching vermintide 2 twitch streams utilizing the twitch vote feature.
If there is an even number of votes between the modifiers, the twitch feature then selects the modifier that was voted in last.
For example:
2 people vote --> 1st vote goes to minotaur and 2nd vote goes to rat ogre --> twitch vote selects rat ogre
Afaik, it happens every time regardless of how many people vote as long as the votes are evenly spread out between the choices. The last person to vote to make it even gets their modifier choice selected.