After Implementing Reverse Proxy Vanity URL, Requisition URLs forming very long url causing error

Another scenario we saw this happening is by clicking on a job requisition from google.
If you search Vitas Jobs on google, you will see results for our open jobs from different websites (linkedin, Indeed, etc.)
We have clicked on most of them and they work fine. But there are others and not really sure why, where we are getting the same WAF error.
Please see example of URL thats being produced from google. Also see screenshots:
https://careers.vitas.com/en/sites/CX_5001/job/30254?utm_medium=search+engine&utm_source=google&utm_campaign=google_jobs_apply&utm_source=google_jobs_apply&utm_medium=organic?0=u&1=t&2=m&3=