When I retrieve a batch to index then click on it, it seems all of them have. Why can we retrieve batches that have already been done? I have wasted a lot of time which is a shame as I enjoy indexing.
When you click on Index and get a batch that is done, it means that it has either been returned by the indexer because they didn't want to complete it or it expired before they finished, or it has been returned by a reviewer for re-indexing because something was not done correctly.
When you receive a batch that is already done, you should carefully check the work, make the necessary corrections, additions, or deletions and resubmit the batch.