As the title says, I've noticed an influx of users recently where they've posted a question where the content of the post is duplicated. If this was a one-off I'd think it were a user error, but these are from different users.
I've not seen this occur on answers, so I suspect it could be related to the question wizard. Here are a few examples I've found lately, which were all created from the wizard: 1, 2, 3, 4.
I don't post questions, and I don't want to try posting one to try to replicate the problem, so the best I can do is post a bug report, which might lead someone to find the issue.
Some commenters feel that it's likely due to lack of users following instructions (which I'm sure would not surprise any of us) and as the wizard has 2 boxes they copy the content from one into the other instead of reading. If this is the cause, though not a "bug", it's certainly not desirable behaviour. As such it would be beneficial that some check is done to ensure that the text in the 2 boxes is sufficiently different. I've therefore added feature-request to this post as well, to address this eventuality.