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Ok, minor mix up with the move surveys.
For the filters, I used an option where you can not continue taking the survey unless you answer the question correctly. This was just a minor thing to make sure you understand how the survey would work.
I've done that before in the past without any problems, but I guess some people got confused and I guess it's my fault for not saying that in the question.
TLDR
About half of the people that took it seem to have put the wrong answer and then just gave up.
Answer the question correctly to take the survey.
If you never completed the survey, you should be able to go back and finish it without being flagged as voting twice.
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