Your question is unspecific on the numbers.
Assuming that you compare "ad clicks" to the number of cases in the dataset, please be aware that SoSci Survey by default removes records where respondents only visited the first page, but did never click "next".
You can configure this behavior in the project settings, in the privacy tab.
If you are worries about other numbers, please kindly state the numbers and what exactly they refer to, thank you.