No, it means the "Date added" sort is broken for shelves. I added ten books to a shelf one at a time with a couple of minutes between. Sorting by date added didn't put them in that order. The order series shelves set the times to one second intervals, and I think I tried one minute. Neither worked. I haven't tried adding them on different days. It is possible it is sorting on just the date part and ignoring the time. I haven't noticed anything wrong with any of the order sorts including "Recently read".
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