Why Is My Phone Charging But Not Charging. Turning it off and back on. Before trying anything else reboot your phone and see if that helps.

If something is preventing your cell phone from charging and you suspect any of the above issues consider using some of these quick fixes. The most obvious step is often one of the most effective. Check your charging cable and USB adapter for signs of damage like breakage or bent prongs.
Computers that have put themselves to sleep will often cut power to USB ports which might explain why you left.
Dont use damaged accessories. Fast charging may not be available with third-party chargers and cables. If you are not feeling it then there are also other signs as well. Overnight charging or overcharging can ruin your phone.
