Sun Sep 26 2021 02:13:50 UTC
It's not a bug. It's an undocumented feature.
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ID Product Comp Assignee Status Resolution Summary Changed
61071 JMeter Main issues RESO DUPL Median calculation : Document algorithm used 2017-09-02
61078 JMeter Main issues RESO DUPL Percentile calculation : Document algorithm used 2017-09-02
61725 JMeter Main issues RESO DUPL Response time table in dashboard report don't match with aggregate report 2018-03-30
3 bugs found.

as

File a new bug in the "Main" component of the "JMeter" product