When editing a group, parents already assigned to the group are removed.

 When I created the groups I used the 'Parents' option available on the drop down.

 .I saved the group.

 I then edited the group to add 2 more parents but had to search for the parents using 'Parents of the following Learners' option.

 The system cleared all the parents already added and only added the 2 new parents.

 The system should store the parents already added to the group and not clear the parents regardless of the search method used.