There is no pre-defined order. If you click on a column header then books will be sorted by that field. I am not sure what you are currently sorted on, but it sounds as if it might be something like added order.
The only potential 'gotcha' When clicking on a column header to sort is that author and title have associated fields author_sort and title_sort and clicking on the author or titles fields sorts according their associated sort fields so you need to check this if ou do not get the expected results.
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