[kbs666]

You misunderstand the purpose of structure only exports.

Structure only exports are intended to allow you to export the structure of a realm to be the basis for a new realm, not to be used to repeatedly add structure to an existing realm.


It might also be that by unchecking the preserve original authorship box you are causing the import procedure to not recognize that the categories in the import are the same as the ones in the existing realm.


So the first thing to try would be to repeat your process without unchecking that box.