I have a new issue I can't figure out with the msrp plugin

I have installed it perfectly on one site and on the second site when I put my products on special I am not getting the strike through the Our Price like on my first website

http://www.naturesorganicmarket.com/...-oz-p-594.html

the 9.24 should have a strikethrough and it doesn't

I have looked through the code though can't find one thing that is different from my first site that has it

I appreciate your help