Redmine

In a project named "A", having sub projects "01","02" and "03" , I try to filter all issues in the projects "A>02" and "A>03" only.
I set my filters "sub project equals to "02" et "03"" [multiselection].
As a return, I get the issues from "A>02", "A>03" but also from "A".
Performing more explorations, whatever I select as subproject (using equals, all, none,different from...), issues from the current project are returned.

Does someone encounter the same issue? Is it a bug to be submitted?