Since we upgraded to 15.9.2, sometimes when accessing a Roadmap we see duplicated Roadmap items on the Grid view. When returning later on to the same Roadmap the items display correctly. It seems intermittent.
We have also noticed that when this happens, the Roadmap Timeline view does not load.
This is caused by DE60687
This is fixed in 18.104.22.168 and 15.9.3
Please also see Performance on opening a Roadmap on odf_scenarios (DE60687)