Glad you got it sorted out, I was worried you fried your mod by pulling the batteries while USB charging. Don't ever do that and seriously don't charge a smok mod via USB. Smok has had some issues with battery explosions and charging (thinking mostly of the smok stick though) and QC, so it could have been tons of things.
Don't charge internal batteries via USB. As you can see from your "percentage battery reading" the mod often won't charge the batteries evenly which is bad. Also, it stresses the batteries, the mod, and the charger, as well as the USB port.
You also need genuine authentic batteries, but that has been covered.
And, don't feel dumb either. There is no vaper, on the planet at this time, who hasn't made an error while vaping, often early on as we learn about vaping.
Best of luck and welcome
Anna