Why do I see plus one (+1), plus two (+2) signs next to the affiliate network label?

Some ads are associated with more than one affiliate networks, mobile carriers, countries, ad networks etc. Due to the size limitation of the single ad unit, we cannot display all the labels. In such cases, we display +n ​icon​ where ​n​ represents the number of additional available labels. You can see other labels by hovering your mouse over the +n icon as shown in the image below: