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Reporting doesn't sort results by default unless you use the page:sorted children or page:sorted descendents/descendants keys from the Page Supplier.
You may not be able to use those keys all the time therefore if you desire sorted results, a good practice would be to always add a Sort macro (Boolean Sort, Natural Sort, Number Sort, Date Sort, and Text Sort) within one of the Reporter macros (Combining Reporter, Content Reporter, Expanding Reporter, Grouping Reporter, Local Reporter, Space Reporter, User Group Reporter, and User Reporter).
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