PayPal payment not auto approved?

I have had two customers so far that have purchased something via PayPal and I received the money in PayPal, but inside a FluentCart it shows on hold and I have to manually click "paid" or select "paid." Why is this?

I don't see that there is an option to disable this and just make the payment already approved inside a FluentCart. And to reiterate, I have received the money in PayPal, so it is in fact paid.