OK, I see in the price field that you have $ $. That's not normal. You should have USD $.
That means that you changed the currency code of your currency. Because of that, the PayPal plugin does not recognize the currency anymore as a supported currency.
If you change that code to a non 3 letters code, that code won't be understood by payment plugins and thus you won't see the on your checkout with that currency. If you want to change the display of prices so that it doesn't use the code but the symbol of the currency, please change the format option of the currency and leave the default value in the currency code.
That's point 7 of the FAQ...