I cannot think of any reason why an order could even go through at all without any transaction appearing in your PayPal account when you look in your logs there.
Just to confirm: you did use your E-junkie account's Seller Admin to Add Product, then you copied the button code we provided from there, and pasted that code into your site, yes?
The purchase process goes like this: the buyer uses your products' Add to Cart buttons to add those items to their cart. When they go to Checkout, we hand-off their order informaiton to your online payment processor, such as PayPal. After they complete payment in PayPal, we receive an IPN from PayPal (assuming their IPN system is working!) informing us of a payment with those order details, then we would issue a seller notification email to the Merchant (you) and a thank-you email (which would also provide any product-download links) to your buyer.
