When posting a question on a SE site you don't have a SE account on yet, logging in can take you to the main page, instead of posting your question, if you're not careful. Users who do not know about the auto-save feature may get the impression that their question is now lost.
A minor issue.
- Go to a Stack Exchange site you don't have an account on yet
- After creating your question, scroll down and click "sign up using Stack Exchange" (incorrectly, yes; but it is super easy to overread)
- On the next page, realize your error and choose "already have an account? Log in"
- Log in and/or create a SE account on this new site
You will be taken on the main page of the SE site, instead of your question.