samsung j7 "device charging slowly"

I've Samsung Galaxy j7 the very 1st model, whenever I connection the device to any charged having output of 2.1 Amp it says device charging slowly use original charger.
I used standard 3rd party chargers adapters such as MIVI APPLE LENOVO ASUS AUKEY also I'm using standard cable of mivi.
Same cable charges it good when i charge it with adapter of samsung came with device having output of 1.5 Amp.
I'm irritated with this pls advice me what could be the reason.

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