Displaying normal and sales price equal

Hi,

I am using the plugin to display some options for the end user and on the products single page, the normal price is equal to the sales price (the crossed one = displayed price). On the shop page the price is displayed correctly and also on the product single page, on page load the price is displayed correctly, it is changed after a few seconds.

Could you please help me with this?

Thank you!

Miruna

For the same product:
Shop Page:

Product Page:

The page I need help with: [log in to see the link]