Since upgrading my Nokia Lumia 925 to Windows Phone 8.1, I'm seeing a strange behaviour: the battery sign shows that it's charging even after I unplug it from the power cord. Sometimes, after a reboot this symbol goes away but comes back randomly. It actually does not charge the battery but just displays this symbol (in the background, battery gets discharged with usage). I have never used a wireless charger and have no idea why this is happening.
How can I fix this?