I have made a report to list every interface belonging to a given node type, which has had >80% traffic the last 5 days. In the report writer preview it looks right (900 records right now..), but in the web page I only get two (2) results.
Another difference is that in Preview mode I get all records matching the filter, and on the web I get what it seems to be one per day.
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Preview mode:
Web page: