Galaxy S4 showing red X while charging

[Unregistered]

After the last system update my phone shows a red x on the battery symbol when it's plugged in. It's never done this before the update and I'm using the same charger I always do, and it does seem to still be charging. I just want to make sure this isn't damaging my phone at all

 

[rxgadget]

Same issue with Verizon GS3