I didn't look closely at the picture at first but uh.. I think you're right. That's definitely not filled correctly, and if it was, it's definitely a defective tank.
That said, I fill mine from the correct end, and I see the exact same sort of leak. Stems from where the cone meets the battery and spreads both directions, just as you see in his picture.
I can't tell from the picture, but I think if you filled from the top, you would know something is wrong as it wouldn't vape correctly at all would it?
I am filling it from the right end. The condensation in the vapor side of the tank is from the same issue as the leak. There is so much liquid it is finding its way into the vapor side. No i am not ...... I got a bad unit, I am ...... i got an old unit. There was no reason for that.