Positive digital tests and light line tests?

Lele • 👨‍👩‍👧‍👧mom to two beautiful daughters 10/25/16 & 6/13/19👧🏼Two angel babies👼🏼 08/18 👼🏼 09/18
Does anyone know why I am able to get positive digital tests but super faint line line tests? I thought the digital tests needed higher amounts of hcg then line tests?