Hi,
We sincerely apologize for the inconvenience and for the delayed response over the weekend.
To resolve this issue, please edit the menu item assigned to that page and add the following page class in the Page Display tab:
fixed-menu
You can refer to this screenshot for guidance:
https://prnt.sc/JD2tQhm0fDOs
After saving the menu item, clear your Joomla and browser cache, then check the page again. This should restore the expected scrolling behavior where the cards collapse one by one, just like in the demo.
Please let us know if the issue persists after applying this change, and we'll be happy to investigate further.