Using both usb ports the macbook doesn't charge, is that normal?

Hi, as headline says I'm using both the usb ports of my macbook pro 13", with an external HD and an externat audio interface. The macbook is attached to the charger, but it's not charging (i guess it's using the power without charging). The Macbook it's not fully charged.
thank you
Federico

And what happens if you disconnect everything from the USB ports? BTW, your charger will kick in when the battery charge falls below 94%.

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