Overview

Are your landing page URLs redirecting and stripping query parameter and UTMs?

• In theme.js, update _updateHistoryState function to the following:

_updateHistoryState: function(variant) {
    if (!history.replaceState || !variant) {
      return;
    }
var newurl =
    window.location.protocol +
    "//" +
    window.location.host +
    window.location.pathname +
    "?variant=" +
    variant.id;

  var pastParam = this._getAllParameters('variant')

  if (pastParam != '') {
    newurl += `&${pastParam}`
  }

  window.history.replaceState({ path: newurl }, "", newurl);
},

/* Get all Paramter */
_getAllParameters: function(except='none') {
  var result = '',
    tmp = [],
    idx = 0;

  location.search
    .substr(1)
    .split("&")
    .forEach(function (item) {
      tmp = item.split("=");
      if ((except == 'none') || (tmp[0] !== except)) {
        if (idx != 0) {
          result += '&';
        }
        idx++;
        result += `${tmp[0]}=${decodeURIComponent(tmp[1])}`;
      }
    });
  return result;
},