Hello, the wix-location module is removing the utm-campaing from the parameters.
There was already a report of this before here: https://www.wix.com/corvid/forum/community-discussion/wix-dropping-custom-query-params-from-url
What is happening to us is exactly the same of what is reported in the mentioned post.
We appreciate your help to solve this bug and gives a temporary workaround.
Thanks.