Was there a brief system glitch which caused some questions to be posted twice?
72826
New question asking form sometimes leads to accidental double posts of questions
33805
Migrated question's answers can be upvoted twice by the same user
107653
Why do some recently asked questions not show up in the question list?
111204
Voting and flagging comments gets enabled when loading additional comments in duplicate question
127414
How was this new user able to post two questions less than 40 minutes apart?
92212
One post with multiple questions or multiple posts?
40958
Question appears multiple times in a search result with Q : and A :
129585
Can multiple edits send an [on-hold] question to Reopen queue more than once?
39772
What is the official etiquette on answering a question twice?
48639
Why prevent duplicate questions?
46943
Part of my post was replaced with random gibberish
45986
“community wiki” checkbox in new question shows a dialog twice when self-answering
22926
Answer count in /questions differs from count on question page
38992
Is the duplicate answer flags raised for exact copies of answers of different users?
133887
Are questions closed as duplicates ever automatically deleted?
64472
Manual "Possible duplicate of" comments are wrongly removed when question is closed
140849
Why didn't my name show up when I marked a question duplicate?