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Problem with Hide/show interactions


I have a problem that cannot be resolved.

I have a collection linked to CMS on my page. When clicking on any element, a pop-up window should open with content for the selected item, but when I click on the next item, the description text is superimposed on top of the previous one! I don’t understand how to hide the previous description to show the actual. Thanks in advance for your help.

Here is my public share link:
(how to access public share link)