Advertising script for the site. Does cashback steal?

Question

JavaScript

Placed on the site a script for displaying advertising - a rotator. After its placement, the income from the cashback service (epn) dropped significantly.
There are suspicions that the script itself steals the cashback session. I looked at the js code that is connected - there is only rotation of banners. But knowledge is not enough to verify this.
Tell me, how can I check if the cashback script is stealing or not?