Why the do I have to pay eBay $20??????

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Ok, when I list items on eBay, you know how there's that screen that shows you the cost for listing an item? Well I always make sure it says FREE for total cost. And anytime I dont have it say free, it's never more than a dollar. Now I currently have 14 items in my active listings, and I get a message from eBay saying I owe a $19.95 invoice fee! What the hell!? It was only Like $7 last time and that was because, like I said some items cost me like 40-70 cents to sell. Why the hell is it so damn high?

Why the do I have to pay eBay $20??????