Why doesn't expanding hidden content work?

Question

Drupal

On the page edem71.ru/content/ceny-2018-g there is a list of links to prices. When you click on the link (for example, Polypropylene pools - see prices), prices (in the form of a table below) should be displayed on the same page. But it turns out that when the page is opened, the prices are already shown on the page without the need to click on the link, and when clicked, on the contrary, they are hidden.
Here is the code used: joxi.ru/LmG3y0QfeBNM1m
What needs to be changed there to make it work correctly - a list of links opens, and prices unfold when clicked?