I recently posted an HIT linking a questionnaire I'd made with Qualtrics. I got all the responses I needed, I made sure there were safeguards in place so that every Worker could only send a finished survey, etc etc. However, the survey codes people are posting don't match up with the survey codes I got from my exported Qualtrics data. All the answers seem fine enough, no one sent in any thing that was incomplete (I took precautions against it), but when I try searching a Worker's posted survey code in my exported Qualtrics csv, I never get a match. I haven't looked through every single survey code, but still. Any idea as to what's going on here? Did Qualtrics just re-randomize all the codes? Was it some other formatting error? It can't be the survey takers themselves, as there's no way that many people would turn out to be frauds or bots. Any insight is appreciated!