Disk Used % column in Qtree Capacity and Utilization report is of data type "String" and not "Integer" because it can also have "Not Applicable" as a valid value when Disk Hard/Soft limit are set to Unlimited. As, this is a string column, filter is taking 80 as a string parameter and displaying result in the range of 8-9.99 and 80-99.99.
As a workaround, we can export the Qtree report in Excel and filter out the value greater than 80.
Thank you for your explanation. Now i understand the background of this 'error'. I check with my internal report-receivers wheater the excel-report (with follow-up filtering by them) or the text-report (with specific looking by them) is better suited for their needs.
Maybe in a coming version a programmatic workaround (extra/temporary table with data-type conversion of the mentioned column) inside OCUM could be a reachable goal by the developers of OCUM. I think such a report would simplify things.