Answer
Those TRK-suffixed triggers are created by Object Subscriptions, not Events — check Solution Manager > Monitoring > Object Subscriptions > Object Subscription Logical Units to see what subscriptions exist on a given Logical Unit and account for those triggers. Events (_EVD/_EVU/_EVI) and Object Subscriptions (_TRK_D/_TRK_U/_TRK_I) are two separate trigger-generating mechanisms on the same underlying tables, and mixing them up when auditing a table's triggers is an easy but understandable point of confusion.