Hello Mate,
 
Thanks you for your question.
I see you config the tier price as wrong way (the tier price greater than main product price). It should be less than main product price.
 
http://www.screencast.com/t/PqwaDsMz
See our demo link: http://demoleotheme.com/casper/index.php/lorem-ipsum-dolor-sit-amet-simple.html
Also, then add custom css code to fix the style for tier prices
 
.tier-prices.product-pricing li{
display: block;
}
.tier-price .price {
float: none;
}