Hi @seo-top,
I’m sorry to hear about this issue but our plugin shouldn’t open links in two windows. It’s possible that there might be something wrong with the site or a possible plugin/theme conflict.
To check, I’d suggest doing a basic debug by switching your theme to Twenty Seventeen and disabling other plugins. But please make sure to have a backup of your site first before doing basic debug.
If the issue still persists after the basic debug, I would encourage you to send a support ticket to our support form to assist you further: https://thirstyaffiliates.com/support/support-request-form
I’m looking forward to hearing from you soon!