Website Clicks – clicks on an ad that includes an offsite link (for example, “Shop Now” button).
Clicks (All) – clicks indicate the number of times a user has clicked your ad. Keep in mind that when a user clicks on an ad, they may be directed offsite (Website Clicks), to your Page, or to a specific Page post. The landing destination will depend on what portion of the ad a user clicks on.
According to this logic, the number of Clicks is always larger or equal to the number of Website Clicks.