Oh ok.
Then what's happening is it's showing the option for lifetime but it's taking you to the yearly subscription. The second image is actually web based, so I think on the web side on the settings page it's being routed wrong.
So lifetime isn't available, it just say it is. Nice catch, we'll fix that asap!
As for the pricing, I looked into it.
There is in fact a discount on yearly.
In Australia it is $14.99 AUD for each month, and $159 for the year.
That same pop up is being populated from the web side of things and is only using US pricing.