Cookie Script is a plugin that helps you manage your cookie preferences and allows you to block first-party and third-party cookies based on your preferences.
Nelio A/B Testing, as we explain here, complies with the GDPR regulations. However, if you have Cooke Script installed and, depending on how you have configured the plugin, it may happen that Cookie Script deletes Nelio A/B Testing cookies and, consequently, the tests you have created are not executed.
In order for you to run A/B tests with Cookie Script installed, follow the Cookie Script instructions to instruct it not to delete Nelio A/B Testing cookies. You can use a regular expression like
/^nab.*/ in the list of allowed cookies.