Why is there a difference between the number of cookies listed and how many cookies appear in the description?

A single cookie can have multiple entries (i.e. be used multiple times on your website and by different providers). It will, however, only be shown once in the description and with the count in brackets. See the example below:

Example: Number of preference cookies listed as 3. Two different preference cookies listed and described - one of them with the count in brackets [x2].