Navigation on the list of reports (guided_reports.pl) is duplicated.
I can not reproduce on current master (Home > Reports > Guided reports wizard)
It may be in 16.11 then.
I can't reproduce it on 16.11. either - can you provide a screenshot?
Navigation being the tabs in the list of saved reports? Duplicate Report Groups can be removed from the Authorized Values list in the Administration menu. https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=18840
I cannot replicate this any longer. I will close it.