I'm admin of Giantess WIki.
A few months ago, I had noticed that the polls had "restarted" (i.e. their vote counter had returned to 0). I had overlooked it thinking that they would manage on their own and that the votes would come back in time. However, I have noticed that polls suffer from strange behavior: The vote counter ranges from 1 to 4, and when a new vote is added, the results are altered at random. In short: polls are suffering from a glitch.
I don't know if this is happening with the other wikis as well, but with Giantess Wiki it is happening with the old and new polls.
Related screenshot: https://giantess.miraheze.org/wiki/File:Gwikipollglitch.png