A.Most likely it's because of our anti-cheating system, that has the following rules:
1) One person (one browser session) can make only 1 conversion per campaign.
2) One IP address can make only 1 click and 1 conversion per unique referral link.
3) To make a conversion, the user should have a marker in their cookies showing that they have clicked on a referral link, and that the click has been recorded.
* To test your own campaign use a incognito browser. To test more than once, refresh the incognito browser each time.