Redmine

A have a bug with issue list and projects with the same name.
On the demo.redmine.org you can see the projects and issues what can you demonstrate the bug.

Steps to reproduce:
1. Let's create three projects ABC, ABC2 and ABC again in ABC2 (sub-project);
2. Let's create two issues for project ABC and "Start date" = 2017-02-25;
3. Let's create one issue for project ABC and "Start date" = 2017-02-27;
4. Let's create one issue for project ABC\ABC2 and "Start date" = 2017-02-26;
5. Let's create one query with group by project name and sorted by "Start date" field;
6. When we apply this query for the issues list – we can see three groups with ABC name, but there is must be only two of it!

Environment:
  Redmine version                3.3.2.stable
  Ruby version                   2.1.10-p492 (2016-04-01) [x86_64-linux]
  Rails version                  4.2.7.1
  Environment                    production
  Database adapter               Mysql2
SCM:
  Subversion                     1.9.5
  Cvs                            1.12.13
  Git                            2.7.4
  Filesystem                     
Redmine plugins:
  redmine_checklists             3.1.5
  redmine_default_assign         0.6
  redmine_default_custom_query   1.2.0
  sidebar_hide                   0.0.8