While looking at website visits generated from ads created in Upsales, you might notice a slight difference, depending on where you're viewing the statistics. 

The reason for the difference is likely because Website Visitors include all interactions, while statistics from Advertising only include actual visitors.

Meaning, there might be a bot or similar that has interacted with your campaign, and this might look like a website visit when looking at Website Visitors (or any external web analytics service, i.e. Google Analytics).

However, looking at the statistics for your ad in Advertising, you'll notice there's a difference in the amount of clicks because only clicks from actual users are registered.