Galaxy S6 charges at 1000 - 1040mA only

[AC Question]

I am using the stock charger for my galaxy s6 and on my charger it shows a rating of 5v at 2.0A but when i test it with "Ampere" app, it shows 1020mA maximum. Is it supposed to charge at this speed? I am using a good quality cable with gold plated connectors and 24awg core. I also tried two different wall outlets.