Best posts so far this bread.
Sometimes a double post happens with two different ID's coming from the same person. It's not the anon who made the double post with the two different ID's, it's the website.
Unfortunately, I cannot provide sauce. I can say that it has happened to me twice.
It reminds me of the problem this board had about 2-3 years ago. Anons posting but for some reason 1-2-3 people were sharing the exact ID.