i’m having exactly the same issue… Did you find a solution in the end?
I noticed I do have one JS error on the page, and it’e in line 56 of wcs3_common.js
jQuery('.wcs3-qtip-box').each(function() {
var html = jQuery('.wcs3-qtip-data', this).html();
jQuery('a.wcs3-qtip', this).qtip({
Uncaught TypeError: undefined is not a function
Thanks for your help