Okay, I think I've done enough investigation to be able to identify two games that manipulated votes in different ways. I want to leave it up to people who participated to determine how I should handle both of these.
Manipulation #1 appears to be either a vote stuffing attempt. The game in question received significantly more votes than other titles, and every vote that it received outside of what appears to be votes by other jam participants would have been perfect max scores.
Manipulation #2 appears to be a vote suppression attempt. The game in question had a soft paywall in place that chased away most votes from participants, but due to advertising outside of itch, they brought in enough unique voters to get themselves top vote counts.
If you submitted a game in the jam, I am interested in your opinion about what I should do with both of these manipulations. Please vote below by saying if you want to consider each of these manipulations allowed or not. Majority rule of those who vote before noon Pacific on November 11 will affect whether or not these prizes will be paid to the current recipients or if the entries will be disqualified and the people next in line will receive the prizes.
As a side note, Shacknews Jam V will not be susceptible to either of these. Prizes in that jam will be split into two separate pools: Developer's Choice and Editor's Choice. Only developers who submitted games will be allowed to vote on the Developer's Choice prize pool.