Unable to select the components on a page

I want to perform a rollout only for the selected components in the page. I noticed that I am not able to select any of the components presented in the pages using the small checkbox in the component's edit bar.

I am not sure why this is happening. All of them are custom components and not OOTB ones.

Any solutions to this, please share them.

Best How To:
I just discovered that in EditBar.js, the listener associated with the checkbox was not functioning. The following loc can be found at /libs/cq/ui/widgets/source/widgets/wcm/EditBar.js if not overlayed.

listeners: {
            check: function(cb, checked) {
                if (checked) {
                    CQ.WCM.select(editBar, true);
                } else {
                    CQ.WCM.deselect(editBar, true);
                }
            }
        }

It worked when the 'check' event was changed to 'selectionChanged' . Clearing the browser cache, reload the page to see the changes. Thanks!