Variables are not updating in custom theme

[rmichaluszek]

Hello, i have the same line of code, one is in file product-prices.tpl, and the other one is in the product.tpl.

<span content="{$product.price_amount}">{$product.price}</span>

The first price is the one that is displayed from product.tpl, and the one below is from the product-prices.tpl.
Problem is, when i change combination, only the price from product-prices.tpl changes, even if its the same lane of code in the product.tpl. anyone knows why is it, and how to make it change always when im selecting different combination?

(first pic is default combination, second pic is after i change combination, the price in the product.tpl stays default)

[Priya Rai]

You must include the same code in product.tpl that is in product-prices.tpl. After that, a variable will appear; simply replace the price's code with this code 
"<span class="regular-price">{$product.regular_price}</span>"