mara89, sorry about the need for an edit, but your screen shot of the SERP showed your search query, along with your domain name, your page url, and competitors' site listings too... the kind of specifics that are explicitly not allowed per our forum Charter [webmasterworld.com
Essentially, you're asking about the url of the result returned. I'm exemplifying your query and result, using example.com instead of your client's domain.
Here's a mockup of the sample url displayed for the site, and the query... [large red widgets]
Large Red Widgets - Officially Certified...
https://example.com > large-red-widgets > utm...cam...
Large Red Widgets - Officially approved. We provide well-made, sturdy, large red widget for professional use.... etc......
Google had truncated the utm tracking code at the end of the url so all that was visible is what I've shown above in red.
As to why you're seeing the tracking code, chances are that you've allowed your Google Ads landing page to be crawled and indexed by Google. Use meta robots noindex to keep the page from appearing in the visible serps, as here... <meta name="robots" content="noindex">
If you used an organic page as a Google Ads landing page, you might have created that problem.. of the landing page with the trailing utm tracking code, outranking your organic result.
There are several other ways this might happen on a dedicated landing page, but not if you've used meta robots noindex.
Note that I created the above mockup simply for your reference. If the utm code is the same as your "AdWords" tracking code, then the above explanation is correct. If the utm code is different from your Google Ads code, which is highly unlikely, then you have a different problem.