Top-level group shows up multiple times in "Groups" overview

Summary

A top-level group shows up multiple times in "Groups" overview.

Steps to reproduce

The issue occurs if the top-level group is displayed on a separate subpage created by pagination. There is probably an issue with the filter:

image

If I change the description of the top-level group and switch to "Last updated" afterwards everything is displayed correctly.

What is the current bug behavior?

The group overview creates one entry for each sencond-level group. See images below.

The following sub-groups of group Robotik:

image

are displayed as follows in the Groups overview:

image

Additionally one entry is created for the top-level group as well, but this one is located on a different pagination page! It behaves as expected:

image

What is the expected correct behavior?

I would expect to only see the topl-level group once as depicted in:

image

Output of checks

Checks are all green.

Results of GitLab environment info

Expand for output related to GitLab environment info 
System information
System:
Current User:   git
Using RVM:      no
Ruby Version:   2.3.3p222
Gem Version:    2.6.6
Bundler Version:1.13.7
Rake Version:   10.5.0
Redis Version:  3.2.5
Git Version:    2.13.0
Sidekiq Version:5.0.0
Go Version:     unknown

GitLab information
Version:        9.3.6
Revision:       b9a169c
Directory:      /opt/gitlab/embedded/service/gitlab-rails
DB Adapter:     postgresql
URL:            https://HOSTNAME
HTTP Clone URL: https://HOSTNAME/some-group/some-project.git
SSH Clone URL:  git@HOSTNAME:some-group/some-project.git
Using LDAP:     no
Using Omniauth: no


GitLab Shell
Version:        5.1.1
Repository storage paths:
  • default: /var/opt/gitlab/git-data/repositories Hooks: /opt/gitlab/embedded/service/gitlab-shell/hooks Git: /opt/gitlab/embedded/bin/git

Results of GitLab application Check

Everything is green.

Edited by Marco Cyriacks