It probably lands into:
- Assuming its not user error, its a dud unit (port).
- it is not a set of true statements. When says 2.1A was that actually measured? Phones often struggle to take 2A. I'm wondering if comparing measured with Elite against non-measured with the factory charger.
- measured at different times like when phone is different charge level. Fuller charged = lower intake.
- measured in different usage, a phone when used often draws less than when not used, so unless you have a meter the act of using an app on the phone produces a false conclusion.
Short of "please expand how you measured" it could be anything from a very wrong statement to a very right statement.