view/src/main/java/se/su/dsv/scipro/group/EditGroupPanel.java

@@ -59,6 +59,11 @@ public class EditGroupPanel extends Panel {
             });
             add(
                 new ListView<>("available_projects", availableProjects) {
+                    {
+                        // must re-use list items to maintain form component (checkboxes) state
+                        setReuseItems(true);
+                    }
+
                     @Override
                     protected void populateItem(ListItem<Project> item) {
                         CheckBox checkbox = new CheckBox("selected", new SelectProjectModel(model, item.getModel()));