These are two different metrics - media platforms like Facebook and Google report clicks on their systems, and Shopalyst reports visits to the brand's landing page. While it is intuitive to expect these two metrics to match up, it is often not the case owing to a variety of factors like accidental clicks, incorrect tagging, network losses, browser settings, cookie consent among others.  

The difference between clicks and visits vary across campaigns and ranges from 25 - 50%.