Our daily task has been a bit constipated backed up and tonight's run removed about 13,000 old, abandoned, closed questionsold, abandoned, closed questions.
Of those 13K, about 400 were the previous "first posts" by their owners - now that they were deleted, the next post by each owner became eligible to be in the queue. And our queue system obliged, creating the bump.
One could argue this is incorrect behavior, but my take is it allows more eyes on content that probably does need reviewing (the owners' previous first posts were just auto-deleted!).