Please make sure that no more than 5000 items are displayed in a list view.
List settings> Advanced settings>Reindex List then compare the result.
In addition, use the list filter panel to check if the value can be filtered using "T2":
you need to merge them up so that you select items that you need in view. You can make this as
(Status equals to "Cancelled" OR Status equals to "Rejected" ) AND
(Cancelled Date >= [TODAY]-180 OR Rejected Date >= [TODAY]-180) AND
(Region equals to "1")
That should give you correct items.