Why doesn't the button with the colorbox-node class open content in the popup on a website with Drupal cms?

Question

Drupal

Hello!
There is a site on Drupal.
Data in the block of performances (names, date, time, id of performances for the "Buy" button) are loaded from the API ticketing system of the usher.
For some reason, the "Book" button with the colorbox-node class
does not open the form in the popup, but on a new page.
Although the "Callback" button on the same page in the header with this class works as it should (opens the form in popup).
Tell me please, what could be the problem? Why doesn't the colorbox-node
of the "Book" button work?
Thank you!