Redmine

Hello, I'm trying to create a subtask. When I fill the form, the subtask is created, but the link is not, I can't see the entry under the Subtask section when I visit the issue page.

I browsed the database and both parent_id column of issues is null and there is no relevant entry in issue_relations table.

I do not know which version is used on the demo.redmine.org, but it works there and the url when creating the subtask is different:

http://demo.redmine.org/projects/mxmxm/issues/new?issue%5Bparent_issue_id%5D=164025&issue%5Btracker_id%5D=1

Url on my installation is:

http://localhost:3000/projects/test/issues/new?issue%5Bparent_issue_id%5D=36

My environment copied from the Information pane

Environment:
      Redmine version                3.3.2.stable
      Ruby version                   2.3.1-p112 (2016-04-26) [x86_64-linux-gnu]
      Rails version                  4.2.7.1
      Environment                    production
      Database adapter               PostgreSQL

Thanks