When configuring classificationtreefacets in a classification space with roots other than the overall parent, not all of the assets that meet the classification of the space are returned in the initial result set of the space. This is because the initial set is already filtered on the root of the registered classificationtreefacets. In my opinion registered facets should not influence the initial set of records in a space. Therefore I suggest to remove this or to give an option to enable or disable this behavior on a classificationtreefacet.
Also: ClassificationCheckboxlistfacets don't show this behavior, however this facet is not useful when having a tree with more than one level.
Please also refer to my support ticket: #8989 and to this forum post: https://support.adamsoftware.net/entries/83657809-Is-there-a-way-to-use-classification-tree-facets-in-a-Classification-space-and-not-limit-the-results
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