Today, I posted something that was intended to be in one category, but ended up to be somehow in a different one. I didn’t notice at first until someone told me that I am in the wrong category, so I quickly went to delete it, and the delete button was unfortunately locked, so I had to self-flag it. Maybe make the deletion treshold like 5 minutes after the post was made to prevent stuff like this?
Why not just move the thread to the correct category? You can click on the pen icon next to the title and change the category.