Remove button in group member management not working as expected

Delete a group member:

1. Open a course with a group.
2. Select "Members management" from "Tools".
3. Select a group and click on the "Manage members" button.
4. Select a member to be deleted and click on the "Remove" button.
5. Click on the "OK" button to definitely delete the selected group member.

-> OK: The process works fine, the selected member is deleted from the group.
-> NOK: When clicking on the "Remove" button, the tick in the checkbox of the selected member is removed.

Expected behaviour:

When clicking on the "Remove" button, the previously selected member must still be ticked off.