Hi, @poppichicken!
Well, I think that's not preventing you to vote. In fact, that "* Required" appears always as an indication, but your email is automatically taken into account as user by Google Forms, to prevent you from voting twice :). It's not telling you that you should change it in order to vote or something similar.
What may be happenning to you (as has already happened to others) is that you may collide when voting with other person that may have been assigned the same game triplet to vote. Whenever that happens, when one of the assigned voters send their vote, the triplet is voted, and cannot be voted twice. Then, when you send your vote, the page is reloaded with a new triplet of games, but Google Forms does not display any message. This is a quite annoying behaviour, but we have found no way to change or prevent it.
When this happens, your vote hasn't been sent and you need to start over again your voting for 3 different games.
Hope that clears the issue.