Error - Notification not visible in Rejected section

We are working on rectifying an error in the 'Notifications' section of the mobile application. We have categories of notification types, one of them is 'Rejected tasks', at this point there is an error when the task rejected notification is visible in the 'All Notifications' view (default) but is not visible in the 'Rejected' section. The same is true for the other sections. However, the notifications are all completely visible in the 'All notifications' section.