There is no line of submissions. Each reviewer chooses the book from available requests that they want to review based on their own personal preferences using the description, genre, author bio and whether or not an incentive package has been purchased.
I think if you submit a new request the error you experienced before will be resolved.
Don't have an ereader? Then read this
"That virtue we appreciate is as much ours as another's. We see so much only as we possess." - Henry David Thoreau